Patent Publication Number: US-11040237-B2

Title: Inflatable plyometric box

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application claims the benefit of U.S. provisional application No. 62/635,883, filed 27 Feb. 2018, which is hereby incorporated by reference as though fully set forth herein. 
    
    
     BACKGROUND 
     a. Field 
     The present disclosure relates to plyometric boxes. In particular, the instant disclosure relates to an inflatable plyometric box. 
     b. Background 
     Plyometrics or jump training is a type of exercise that includes repeated and rapid stretching and contracting of the muscles to increase muscular power and explosiveness. Plyometrics have become a popular component of strength and conditioning programs and are integral components of high intensity interval training (HIIT) programs, such as CrossFit®. 
     Jumping is a typical example of the kinds of exercises used in plyometrics. As such, a plyometric box, or “plyo box,” is an exercise device that is intended for use as a platform for performing plyometric exercise, such as box jumps, depth jumps, step ups, step ups with barbells, and burpee box jump overs, among others. A box jump, for example, involves a person standing on the floor facing a plyometric box and jumping with both feet onto the top surface of the plyometric box. The box jump typically involves repeatedly jumping onto and off the plyometric box. A depth jump involves jumping or falling off a short plyometric box onto the floor and then quickly jumping onto a taller plyometric box. 
     Typical plyometric boxes comprise wooden or metal frames or boxes. However, typical plyometric boxes present a high risk of injury to a user if they fail to land properly on the plyometric box and/or if they slip off the edge of the plyometric box. As users rapidly and repeatedly attempt to jump onto the plyometric box, the risk of injury increases due to fatigue and/or lack of concentration. For example, if a user fails to clear the top edge of the typical plyometric box, the user can catch their shin on the metal or wooden edge of the typical plyometric box. This often leads to scratches or to more serious deep wounds or gashes requiring medical treatment. The same injury can occur if the user fails to land squarely on the top of the typical plyometric box and slips off an edge of the typical plyometric box. Additionally, if a user fails to land properly on the typical plyometric box, they can also potentially injure other parts of their body, including their chest, arms and/or head by hitting the plyometric box. 
     In addition to the potential for injury presented by typical plyometric boxes, they are difficult to store and transport. Typical plyometric boxes are large and heavy and awkward to move around. While some typical plyometric boxes can be nested within one another, they often are too big to fit into an automobile, thus limiting the ability to move plyometric boxes from gym to gym or from a gym to a park, or to another location where a user desires to engage in plyometric exercises. For example, a personal trainer is unlikely to transport typical plyometric boxes to a park for an outdoor training session or into the home of an individual. Therefore, due to the difficulty in transporting typical plyometric boxes, plyometric jumping exercises are limited to the gym. 
     The foregoing discussion is intended only to illustrate the present field and should not be taken as a disavowal of claim scope. 
     BRIEF SUMMARY 
     The present disclosure relates to an inflatable plyometric box. In particular, the instant disclosure relates to an inflatable plyometric box having a first inflatable member adapted to be inflated to a pressure, a second inflatable member on top of the first inflatable member and adapted to be inflated to a pressure, and a connecting member connected to the first inflatable member and the second inflatable member which secures the first inflatable member to the second inflatable member. The first and second inflatable members incorporate drop stitch technology which provides a high degree of rigidity to first and second inflatable members when the first and second inflatable members are inflated to the pressures. Thus, when the first and second inflatable members are inflated to the pressures, the inflatable plyometric box is substantially rigid to support a user landing on the top of the inflatable plyometric box. 
     In another aspect of the disclosure, the inflatable plyometric box may additionally include a stabilizing member which may be connected to the bottom of the inflatable plyometric box, wherein the stabilizing member is adapted to increase the stability of the inflatable plyometric box. 
     In other aspects of the disclosure, the stabilizing member may be releasably connected to the inflatable plyometric box. 
     In other aspects of the disclosure, the stabilizing member may be integrally formed with the inflatable plyometric box. 
     Another aspect of the disclosure is directed to an inflatable plyometric box, comprising a first inflatable member adapted to be inflated to a first pressure, a second inflatable member above the first inflatable member, the second inflatable member adapted to be inflated to a second pressure, and a connecting member connected to the first inflatable member and the second inflatable member which secures the first inflatable member to the second inflatable member. The first inflatable member comprises a first lower surface, a first upper surface, and a first population of drop stitch threads connected to and extending between the first lower surface and the first upper surface. The second inflatable member comprises a second lower surface, a second upper surface, and a second population of drop stitch threads connected to and extending between the second lower surface and the second upper surface. 
     Yet another aspect of the disclosure is directed to an inflatable plyometric box comprising a first inflatable member adapted to be inflated to a first pressure, a second inflatable member above the first inflatable member, the second inflatable member adapted to be inflated to a second pressure, and a connecting member connected to the first inflatable member and the second inflatable member which secures the first inflatable member to the second inflatable member. The first inflatable member comprises a first lower surface, a first upper surface, a first population of drop stitch threads connected to and extending between the first lower surface and the first upper surface, a first sidewall extending from the first lower surface to the first upper surface, and a first inflation valve. The second inflatable member comprises a second lower surface, a second upper surface, a second population of drop stitch threads connected to and extending between the second lower surface and the second upper surface, a second sidewall extending from the second lower surface to the second upper surface, and a second inflation valve. When the first inflatable member is inflated to the first pressure and the second inflatable member is inflated to the second pressure, the first upper surface of the first inflatable member is in contact with the second lower surface of the second inflatable member, and the inflatable plyometric box is substantially rigid to support a user landing on the second upper surface. 
     Yet another aspect of the disclosure is directed to an inflatable plyometric box comprising a first inflatable member adapted to be inflated to a first pressure, a second inflatable member above the first inflatable member, the second inflatable member adapted to be inflated to a second pressure, a third inflatable member between the first inflatable member and second inflatable member, the third inflatable member adapted to be inflated to a third pressure, and an expandable connecting member connected to the first inflatable member and the second inflatable member. The first inflatable member comprises a first lower surface, a first upper surface, and a first population of drop stitch threads connected to and extending between the first lower surface and the first upper surface. The second inflatable member comprises a second lower surface, a second upper surface, and a second population of drop stitch threads connected to and extending between the second lower surface and the second upper surface. The third inflatable member comprises a third lower surface, a third upper surface, and a third population of drop stitch threads connected to and extending between the third lower surface and the third upper surface. The expandable connecting member comprises a zipper which is adapted to be in a closed position when the third inflatable member is deflated and is adapted to be in an open position when the third inflatable member is inflated to the third pressure. 
     Yet another aspect of the disclosure is directed to an inflatable plyometric box comprising an inflatable member adapted to be inflated to a pressure, wherein the inflatable member comprises a lower surface, an upper surface, and a population of drop stitch threads connected to an extending between the lower surface and the upper surface. When the inflatable member is inflated to the pressure, the inflatable member is substantially rigid to support a user landing on the upper surface of the inflatable member, the inflatable member has a height from the lower surface to the upper surface, a length, and a width, and the height is no less than 15 inches. 
     The foregoing and other aspects, features, details, utilities, and advantages of the present disclosure will be apparent from reading the following description and claims, and from reviewing the accompanying drawings. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a front perspective view of an inflatable plyometric box according to a first embodiment of the disclosure. 
         FIG. 2  is an image of the top of an inflatable plyometric box according to the first embodiment of the disclosure. 
         FIG. 3  is a cross-sectional view of the inflatable plyometric box of  FIG. 2 , taken along line  3 - 3  in  FIG. 2 . 
         FIG. 4  is a front view of an inflatable plyometric box according to a second embodiment of the disclosure. 
         FIG. 5  is a top plan view of an inflatable plyometric box according to the second embodiment of the disclosure. 
         FIG. 6  is a front view of an inflatable plyometric box according to a third embodiment of the disclosure. 
         FIG. 7  is a bottom view of an inflatable plyometric box according to the third embodiment of the disclosure. 
         FIG. 8  is a front view of an inflatable plyometric box according to a fourth embodiment of the disclosure. 
         FIG. 9  is an enlarged, fragmentary view of the region in the dashed circle labeled “ FIG. 9 ” in  FIG. 8 , depicting a cross-sectional view of a portion of an inflatable plyometric box according to the fourth embodiment of the disclosure. 
         FIG. 10  is similar to  FIG. 3 , but is a cross-sectional view of an inflatable plyometric box according to a fifth embodiment of the disclosure. 
         FIG. 11  is an enlarged, fragmentary view of the region in the dashed circle labeled “ FIG. 11 ” in  FIG. 10 , depicting a cross-sectional view of a portion of an inflatable plyometric box according to a fifth embodiment of the disclosure. 
         FIG. 12  is an isometric view of an inflatable plyometric box according to a sixth embodiment of the disclosure. 
         FIG. 13  is similar to  FIG. 3 , but is a cross-sectional view of an inflatable plyometric box according to the sixth embodiment of the disclosure. 
         FIG. 14  is a front view of an inflatable plyometric box according to a seventh embodiment of the disclosure. 
         FIG. 15  is a front view of an expandable inflatable plyometric box in a non-expanded state according to an eighth embodiment of the disclosure. 
         FIG. 16  is a front view of an expandable inflatable plyometric box in an expanded state according to an eighth embodiment of the disclosure. 
         FIG. 17  is a front view of an inflatable plyometric box according to a ninth embodiment of the disclosure. 
         FIG. 18  is a top plan view of an inflatable plyometric box according to the ninth embodiment of the disclosure. 
         FIG. 19  is a partial cross-sectional view of the inflatable plyometric box of  FIG. 18 , taken along line  19 - 19  in  FIG. 18 . 
         FIG. 20  is a front view of an inflatable plyometric box according to a tenth embodiment of the disclosure. 
         FIG. 21  is a top plan view of an inflatable plyometric box according to the tenth embodiment of the disclosure. 
         FIG. 22  is a front view of two inflatable plyometric boxes according to the tenth embodiment of the disclosure stacked upon each other. 
         FIG. 23  is a perspective view of an inflatable plyometric box coupled to a stabilizing member, according to an eleventh embodiment of the disclosure. 
         FIG. 24  is a perspective view of an inflatable plyometric box coupled to a stabilizing member, according to a twelfth embodiment of the disclosure. 
         FIG. 25  is a lower perspective view of an inflatable plyometric box coupled to a stabilizing member, according to a thirteenth embodiment of the disclosure. 
         FIG. 26  is an upper perspective view of the stabilizing member, according to the thirteenth embodiment of the disclosure. 
         FIG. 27  is a lower perspective view of an inflatable plyometric box coupled to a stabilizing member, according to a fourteenth embodiment of the disclosure. 
         FIG. 28  is an upper perspective view of the stabilizing member, according to the fourteenth embodiment of the disclosure. 
     
    
    
     Like reference numbers may refer to like or equivalent parts in the several views. 
     DETAILED DESCRIPTION 
     Several embodiments of a plyometric box, such as an inflatable plyometric box are disclosed herein. Details of the various embodiments of the present disclosure are described below with specific reference to the figures. Although many of the examples described below make reference to an exercise box, such as an inflatable plyometric box, the present inventor also contemplates the examples herein may also be applicable to other apparatuses. For example, the examples disclosed herein may be applicable to an exercise box, a stool, a bench, a table, a step ladder, or a combination thereof (e.g., a multifunctional device). 
     With reference to  FIGS. 1, 2 and 3 , one embodiment of an inflatable plyometric box  10  of the disclosure is shown and described. Inflatable plyometric box  10  has a bottom side  11  for placing on the floor or ground and a top side  13  for a user to land upon. Inflatable plyometric box  10  comprises a first inflatable member  12   a , a second inflatable member  12   b  located above first inflatable member  12   a , and a connecting member  40  which is connected to first inflatable member  12   a  and second inflatable member  12   b . Connecting member  40  secures or connects first inflatable member  12   a  to second inflatable member  12   b . First and second inflatable members  12   a ,  12   b  are substantially similar or identical and each have an enclosed interior or chamber which is adapted to be airtight and hold air (or any gas) at a desired pressure. As is described more fully below, each of first and second inflatable members  12   a ,  12   b  incorporate drop stitch technology which allows first and second inflatable members  12   a ,  12   b  to hold air (or any gas) at higher pressures and provides a high degree of rigidity to each of first and second inflatable members  12   a ,  12   b  when first and second inflatable members  12   a ,  12   b  are inflated. Inflatable plyometric box  10  is described herein with second inflatable member  12   b  being on top of first inflatable member  12   a . Thus, part of first inflatable member  12   a  is proximate to and forms the bottom side  11  of inflatable plyometric box  10  and part of second inflatable member  12   b  is proximate to and forms the top side  13  of inflatable plyometric box  10 . However, with first and second inflatable members  12   a ,  12   b  being substantially similar or identical, inflatable plyometric box  10  may be used right side up or upside down. Thus, inflatable plyometric box  10  may be used with first inflatable member  12   a  on top of second inflatable member  12   b.    
     When first inflatable member  12   a  and second inflatable member  12   b  are each inflated to a desired pressure, first inflatable member  12   a  and second inflatable member  12   b  touch each other, with first inflatable member  12   a  below and supporting second inflatable member  12   b . Connecting member  40  is connected to both first inflatable member  12   a  and second inflatable member  12   b  and connects first inflatable member  12   a  to second inflatable member  12   b . Connecting member  40  prevents relative movement between first and second inflatable members  12   a ,  12   b  when first and second inflatable members  12   a ,  12   b  are inflated to the desired pressure. That is, connecting member  40  prevents first and second inflatable members  12   a ,  12   b  from moving side-to-side (or laterally) relative to one another when inflated to the desired pressure. Additionally, connecting member  40  prevents first and second inflatable members  12   a ,  12   b  from moving away from one another when inflated to the desired pressure. When first and second inflatable members  12   a ,  12   b  are inflated to the desired pressure, they provide an inflatable plyometric box  10  which can be jumped on by a user engaging in physical activity or exercise. The desired pressures to which first and second inflatable members  12   a ,  12   b  may be inflated range from about 8 psi (about 55.2 kPa) to about 20 psi (about 137.9 kPa). In various embodiments, for example only and without limitation, the desired pressures to which first and second inflatable members  12   a ,  12   b  may be inflated are about 15 psi (about 103.4 kPa). 
     Each component of an embodiment of inflatable plyometric box  10  will now be described in turn, beginning with first inflatable member  12   a , followed by second inflatable member  12   b , and then connecting member  40 . 
     As described above, in various embodiments, first and second inflatable members  12   a ,  12   b  are substantially similar or identical. Therefore, like portions of first and second inflatable members  12   a ,  12   b  are hereinafter designated by the same reference numerals, for example, first upper surface  16   a  of first inflatable member  12   a  being differentiated from the second upper surface  16   b  of second inflatable member  12   b  by replacing “a” with “b”. Where there are differences between the first and second inflatable members  12   a ,  12   b , those differences will be noted. 
     Referring now to  FIG. 1 , first inflatable member  12   a  includes a first lower surface  14   a , a first upper surface  16   a , a population of drop stitch threads  18   a  connected to and extending there between, and a first sidewall  20   a  extending around the perimeter of both first lower surface  14   a  and first upper surface  16   a . First lower surface  14   a  forms the bottom of first inflatable member  12   a  as well as the bottom side  11  of inflatable plyometric box  13 . First upper surface  16   a  forms the top of first inflatable member  12   a . First lower and upper surfaces  14   a ,  16   a  are rectangular in shape with rounded corners; however, it will be understood that first lower and upper surfaces  14   a ,  16   a  may have any shape without departing from the scope of the disclosure. For example only and without limitation, first lower and upper surfaces  14   a ,  16   a  may be circular, rectangular, ovular, hexagonal, octagonal, pentagonal, etc. 
     A first population of drop stitch threads  18   a  are connected to and extend between first lower surface  14   a  and first upper surface  16   a . The first population of drop stitch threads  18   a  extends substantially throughout first inflatable member  12   a . That is, first lower and upper surfaces  14   a ,  16   a  are interconnected by regularly-spaced yarns or threads  18   a  that are arranged across some or all of the surface areas of first lower and upper surfaces  14   a ,  16   a . Each of the drop stitch threads  18   a  have lower and upper end portions which connect to, respectively, the first lower and upper surfaces  14   a  and  16   a . First lower surface  14   a  and first upper surface  16   a  are both water and air impervious and are quite flexible in their non-inflated condition. 
     The lower and upper ends of the drop stitch threads  18   a  are embedded within the first lower surface  14   a  and first upper surface  16   a , respectively. This is done in a manner such that first inflatable member  12   a  is able to withstand rather heavy loads. Thus, when first inflatable member  12   a  is inflated, first lower surface  14   a  and first upper surface  16   a  tend to move apart, but are restrained by the drop stitch threads  18   a  which become taut due to the inflation. The tension in first lower and upper surfaces  14   a ,  16   a  from the inflation pressure, in combination with the tension in drop stitch threads  18   a , gives rise to a hard, rigid structure, which can be jumped and landed upon by a user. 
     The population of drop stitch threads  18   a  may be arranged in any pattern along first lower and upper surfaces  14   a ,  16   a  known in the art without departing from the scope of the disclosure. For example only and without limitation, in various embodiments, the drop stitch threads  18   a  may be in a linear, zigzag, random or other pattern, including, but not limited to “X” and “V” patterns. The use of drop stitch threads  18   a  in first inflatable member  12   a  allows first inflatable member  12   a  to be inflated to a pressure of about 15 psi (about 103.4 kPa). 
     First sidewall  20   a  extends around the perimeter of both first lower surface  14   a  and first upper surface  16   a  and forms the sides of first inflatable member  12   a . First sidewall  20   a  has a bottom end  22   a  which is adhered or fused to the perimeter of first lower surface  14   a  forming first lower seam  26   a . Additionally, first sidewall  20   a  has a top end  24   a  which is adhered or fused to the perimeter of first upper surface  16   a  forming first upper seam  28   a . First lower surface  14   a , first sidewall  20   a  and first upper surface  16   a  cooperate to form an enclosed interior or chamber which is adapted to be airtight and hold air (or any gas) at a desired pressure. While first sidewall  20   a  is shown as a single sheet of material extending around the perimeter of first lower and upper surfaces  14   a ,  16   a , it will be understood that in various embodiments, first sidewall  20   a  may be made of more than one sheet of material (e.g., 2 sheets, 3 sheets, 4 sheets, 5, sheets, or more) without departing from the scope of the disclosure. 
     Located in first sidewall  20   a  is a first inflation valve  34   a  through which air (or any gas) may be directed to inflate first inflatable member  12   a  (see  FIG. 1 ). In various embodiments, first inflation valve  34   a  may be a one-way valve which prevents blow back during inflation. First inflation valve  34   a  may be locked in an open position for fast deflation prior to storage and/or transportation. Although first inflation valve  34   a  is described as a one-way valve, it will be understood that any type of inflation valve known in the art may be used without departing from the scope of the disclosure. 
     First inflatable member  12   a  may also optionally include two narrow strips of material proximate to or on top of first lower and upper seams  26   a ,  28   a . That is, a first lower strip  30   a  may be adhered to or fused to first inflatable member  12   a  proximate to or on top of first lower seam  26   a  and a first upper strip  32   a  may be adhered to or fused to first inflatable member  12   a  proximate to or on top of first upper seam  28   a . First lower and upper strips  30   a ,  32   a  may each serve: (1) to reinforce first lower and upper seams  26   a ,  28   a ; and/or (2) as a visual indicator. 
     Thus first lower and upper seams  26   a ,  28   a  may optionally be reinforced with first lower and upper strips  30   a ,  32   a . First lower and upper strips  30   a ,  32   a  may be narrow strips of material that may be adhered or fused to first inflatable member  12   a  and overlap first lower and upper seams  26   a ,  28   a , respectively. That is, first lower and upper strips  30   a ,  32   a  cover first lower and upper seams  26   a ,  28   a , respectively, along their perimeters and serve to reduce or eliminate the degradation or failure of first lower and upper seams  26   a ,  28   a  due to inflatable plyometric box  10  being repeatedly jumped on by a user. First upper strip  32   a  is covered by connecting member  40 ; however, first lower strip  30   a  is exposed. Therefore, first lower strip  30   a  further protects first lower seam  26   a  from wear-and-tear from repeated contact with the floor, a user&#39;s apparel (e.g., shoes, clothing), a user&#39;s body or parts thereof (e.g., hands, feet, legs, etc.), and/or other objects. 
     In various embodiments, for example only and without limitation, in addition to providing reinforcement and wear resistance, first lower strip  30   a  may have a contrasting color from the color of first sidewall  20   a  and/or first lower surface  14   a . Thus first lower strip  30   a  may visually stand out to a user such that a user can easily distinguish the boundary of first lower surface  14   a . First lower strip  30   a  may be, including but not limited to, a bright color, a fluorescent color, alternating in color (e.g., black and white, black and yellow), reflective, phosphorescent, “glow-in-the-dark”, or any combination thereof. In some embodiments, first upper strip  32   a  may also have a contrasting color in the same manner as first lower strip  30   a ; however, as first upper strip  32   a  is covered by connecting member  40 , a user will not be able to see first upper strip  32   a.    
     It will be understood that in other embodiments, for example only and without limitation, first lower strip  30   a  and/or first upper strip  32   a  may be located proximate to first lower and upper seams  26   a ,  28   a , respectively, but not on top of first lower and upper seams  26   a ,  28   a . In such embodiments, first lower and upper strips  30   a ,  32   a  may not provide any reinforcement or wear protection, but one or both of first lower and upper strips  30   a ,  32   a  may have a contrasting color as described above. Thus, first lower strip  30   a  and/or first upper strip  32   a  may visually stand out to a user. 
     As shown, first lower surface  14   a  of inflatable plyometric box  10 , is intended to be in contact with a floor during use. Therefore, in various embodiments, for example only and without limitation, first lower surface  14   a  may include an anti-skid or non-slip surface to reduce or eliminate the possibility of inflatable plyometric box  10  moving along the floor during use. 
     First inflatable member  12   a  may be constructed of a variety of materials known in the art, including but not limited to, polyester, polyurethane, vinyl, polyvinyl chloride (PVC), neoprene, other synthetic or natural materials known in the art, or any combination thereof. Thus for example only and without limitation, first lower surface  14   a , first upper surface  16   a , first sidewall  20   a , first lower reinforcement strip  30   a , and first upper reinforcement strip  32   a  of first inflatable member  12   a  are all constructed of PVC. For example only and without limitation, first lower surface  14   a  and first upper surface  16   a  may be made of 1000 denier polyester fabric; however stronger or weaker fabrics may be used without departing from the scope of the present disclosure. These components may all be adhered or fused together in a variety of ways known in the art, including but not limited to, adhesives, stitching, radiofrequency (RF) welding, heat welding, or any combination thereof. 
     Second inflatable member  12   b  of inflatable plyometric box  10  will now be described. In certain embodiments, second inflatable member  12   b  is substantially similar or identical to first inflatable member  12   a . Second inflatable member  12   b  is above first inflatable member  12   a  and is connected to first inflatable member  12   a  via connecting member  40  (described in greater detail elsewhere herein). 
     With continued reference to  FIG. 2 , second inflatable member  12   b  includes a second lower surface  14   b , a second upper surface  16   b , a population of drop stitch threads  18   b  connected to and extending there between, and a second sidewall  20   b  extending around the perimeter of both second lower surface  14   b  and second upper surface  16   b . Second lower surface  14   b  forms the bottom of second inflatable member  12   b  and second upper surface  16   b  forms the top of second inflatable member  12   b  as well as the top side  13  of inflatable plyometric box  10 . As shown, when inflatable plyometric box  10  is inflated to the desired pressure, second lower surface  14   b  of second inflatable member  12   b  contacts first upper surface  16   a  of first inflatable member  12   a , and second upper surface  16   b  forms the top of inflatable plyometric box  10  onto which a user may jump and land upon. Second lower and upper surfaces  14   b ,  16   b  are rectangular in shape with rounded corners; however, it will be understood that second lower and upper surfaces  14   b ,  16   b  may have any shape without departing from the scope of the disclosure. For example only and without limitation, second lower and upper surfaces  14   b ,  16   b  may be circular, rectangular, ovular, hexagonal, octagonal, pentagonal, etc. 
     A second population of drop stitch threads  18   b  are connected to and extend between second lower surface  14   b  and second upper surface  16   b . The second population of drop stitch threads  18   b  extends substantially throughout second inflatable member  12   b . That is, second lower and upper surfaces  14   b ,  16   b  are interconnected by regularly-spaced yarns or threads  18   b  that are arranged across some or all of the surface areas of second lower and upper surfaces  14   b ,  16   b . Each of the drop stitch threads  18   b  have lower and upper end portions which connect to, respectively, the second lower and upper surfaces  14   b  and  16   b . Second lower surface  14   b  and first upper surface  16   b  are both water and air impervious and are quite flexible in their non-inflated condition. 
     The lower and upper ends of the drop stitch threads  18   b  are embedded within second lower surface  14   b  and second upper surface  16   b , respectively. This is done in a manner such that second inflatable member  12   b  is able to withstand rather heavy loads. Thus, when second inflatable member  12   b  is inflated, second lower surface  14   b  and second upper surface  16   b  tend to move apart, but are restrained by drop stitch threads  18   b  which become taut due to the inflation. The tension in second lower and upper surfaces  14   b ,  16   b  from the inflation pressure, in combination with the tension in drop stitch threads  18   b , gives rise to a hard, substantially rigid structure, which can be jumped and landed upon by a user. 
     The population of drop stitch threads  18   b  may be arranged in any pattern along second lower and upper surfaces  14   b ,  16   b  known in the art without departing from the scope of the disclosure. For example only and without limitation, in various embodiments, the drop stitch threads  18   b  may be in a linear, zigzag, random or other pattern, including, but not limited to “X” and “V” patterns. The use of drop stitch threads  18   b  in second inflatable member  12   b  allows second inflatable member  12   b  to be inflated to a desired pressure of about 15 psi (about 103.4 kPa). 
     Second sidewall  20   b  extends around the perimeter of both second lower surface  14   b  and second upper surface  16   b  and forms the sides of second inflatable member  12   b . Second sidewall  20   b  has a bottom end  22   b  which is adhered or fused to the perimeter of second lower surface  14   b  forming second lower seam  26   b . Additionally, second sidewall  20   b  has a top end  24   b  which is adhered or fused to the perimeter of second upper surface  16   b  forming second upper seam  28   b . Second lower surface  14   b , second sidewall  20   b  and second upper surface  16   b  cooperate to form an enclosed interior or chamber which is adapted to be airtight and hold air (or any gas) at a desired pressure. While second sidewall  20   b  is shown as a single sheet of material extending around the perimeter of second lower and upper surfaces  14   b ,  16   b , it will be understood that in various embodiments, second sidewall  20   b  may be made of more than one sheet of material (e.g., 2 sheets, 3 sheets, 4 sheets, 5, sheets, or more) without departing from the scope of the disclosure. 
     Located in second sidewall  20   b  is a second inflation valve  34   b  through which air (or any gas) may be directed to inflate second inflatable member  12   b  (see  FIG. 1 ). In various embodiments, second inflation valve  34   b  may be a one-way valve which prevents blow back during inflation. Second inflation valve  34   b  may be locked in an open position for fast deflation prior to storage and/or transportation. Although second inflation valve  34   b  is described as a one-way valve, it will be understood that any type of inflation valve known in the art may be used without departing from the scope of the disclosure. 
     Second inflatable member  12   b  may also optionally include two narrow strips of material proximate to or on top of second lower and upper seams  26   b ,  28   b . That is, a second lower strip  30   b  may be adhered to or fused to second inflatable member  12   b  proximate to or on top of second lower seam  26   b  and a second upper strip  32   b  may be adhered to or fused to second inflatable member  12   b  proximate to or on top of second upper seam  28   b . Second lower and upper strips  30   b ,  32   b  may each serve: (1) to reinforce second lower and upper seams  26   b ,  28   b ; and/or (2) as a visual indicator. 
     Thus second lower and upper seams  26   b ,  28   b  may optionally be reinforced with second lower and upper strips  30   b ,  32   b . Second lower and upper strips  30   b ,  32   b  may be narrow strips of material that may be adhered or fused to second inflatable member  12   b  and overlap second lower and upper seams  26   b ,  28   b , respectively. That is, second lower and upper strips  30   b ,  32   b  cover second lower and upper seams  26   b ,  28   b , respectively, along their perimeters and serve to reduce or eliminate the degradation or failure of second lower and upper seams  26   b ,  28   b  due to inflatable plyometric box  10  being repeatedly jumped on by a user. Second lower strip  30   b  is covered by connecting member  40 ; however, second upper strip  32   b  is exposed (this is the mirror opposite of first inflatable member  12   a , where first upper strip  32   a  is covered by connecting member  40  and first lower strip  30   a  is exposed). Therefore, second upper strip  32   b  further protects second upper seam  28   b  from wear-and-tear from repeated contact with a user&#39;s apparel (e.g., shoes, clothing), a user&#39;s body or parts thereof (e.g., hands, feet, legs, etc.), the floor, and/or other objects. 
     In various embodiments, for example only and without limitation, in addition to providing reinforcement and wear resistance, second upper strip  32   b  may have a contrasting color from the color of second sidewall  20   b  and/or second upper surface  16   b . Thus second upper strip  32   b  may visually stand out to a user such that a user can easily distinguish the boundary of second upper surface  16   b . This may be particularly helpful on the top of inflatable plyometric box  10  as it will aid a user in gauging the height and location of the top of inflatable plyometric box  10 . Second upper strip  32   b  may be, including but not limited to, a bright color, a fluorescent color, alternating in color (e.g., black and white, black and yellow), reflective, phosphorescent, “glow-in-the-dark”, or any combination thereof. In some embodiments, second lower strip  30   b  may also have a contrasting color in the same manner as second upper strip  32   b ; however, as second lower strip  30   b  is covered by connecting member  40 , a user will not be able to see second lower strip  30   b.    
     It will be understood that in other embodiments, for example only and without limitation, second lower strip  30   b  and/or second upper strip  32   b  may be located proximate to second lower and upper seams  30   b ,  28   b , respectively, but not on top of second lower and upper seams  26   b ,  28   b . In such embodiments, second lower and upper strips  30   b ,  32   b  may not provide any reinforcement or wear protection, but one or both of second lower and upper strips  30   b ,  32   b  may have a contrasting color as described above. Thus, second upper strip  32   b  and/or second lower strip  30   b  may visually stand out to a user. 
     As shown, second upper surface  16   b  of inflatable plyometric box  10 , is intended to be the surface that a user jumps and lands upon during use. Therefore, in various embodiments, for example only and without limitation, second upper surface  16   b  may include an anti-skid or non-slip surface to reduce or eliminate the possibility of the user slipping or sliding off of second upper surface  16   b  after they have landed upon inflatable plyometric box  10 . 
     Second inflatable member  12   b  may be constructed of a variety of materials known in the art, including but not limited to, polyester, polyurethane, vinyl, polyvinyl chloride (PVC), neoprene, other synthetic or natural materials known in the art, or any combination thereof. Thus for example only and without limitation, second lower surface  14   b , second upper surface  16   b , second sidewall  20   b , second lower reinforcement strip  30 , and second upper reinforcement strip  32   b  of second inflatable member  12   b  are all constructed of PVC. For example only and without limitation, second lower surface  14   b  and second upper surface  16   b  may be made of 1000 denier polyester fabric; however stronger or weaker fabrics may be used without departing from the scope of the present disclosure. These components may all be adhered or fused together in a variety of ways known in the art, including but not limited to, adhesives, stitching, radiofrequency (RF) welding, heat welding, or any combination thereof. 
     As referenced above, second inflatable member  12   b  is located directly above and comes into contact with first inflatable member  12   a , when first and second inflatable members  12   a ,  12   b  are inflated to their desired pressures. That is, when first inflatable member  12   a  and second inflatable member  12   b  are inflated to a desired pressure, first upper surface  16   a  of first inflatable member  12   a  is in contact with second lower surface  14   b  of second inflatable member  12   b . First and second inflatable members  12   a ,  12   b  are connected via connecting member  40 . In this embodiment, connecting member  40  comprises a sheet  42  of material which has a bottom end  44  adhered or fused to the perimeter of first sidewall  20   a  of first inflatable member  12   a  and a top end  46  adhered or fused to the perimeter of second sidewall  20   b  of second inflatable member  12   b . For example only and without limitation, bottom end  44  of sheet  42  is adhered or fused at generally the midpoint along the vertical length of first sidewall  20   a  of first inflatable member  12   a . Additionally, for example only and without limitation, top end  46  of sheet  42  is adhered or fused at generally the midpoint along the vertical length of second sidewall  20   b  of second inflatable member  12   b.    
     The dimension and placement of sheet  42  on first and second inflatable members  12   a ,  12   b  is such that when first and second inflatable members  12   a ,  12   b  are inflated to a desired pressure, first and second inflatable members  12   a ,  12   b  contact one another. The inflation of first and second inflatable members  12   a ,  12   b  to their desired pressures, sheet  42  connecting the inflated first and second inflatable members  12   a ,  12   b , the contact of first upper surface  16   a  with second lower surface  14   b , and the drop stitch structure of first and second inflatable members  12   a ,  12   b  produces a substantially rigid structure which is able to support a user landing upon second upper surface  16   b  of second inflatable member  12   b  Thus when first and second inflatable members  12   a ,  12   b , inflatable plyometric box  10  is substantially rigid such that it can support a user jumping on and landing upon inflatable plyometric box  10 . 
     Thus, sheet  42  serves as connecting member  40  and prevents relative movement between first and second inflatable members  12   a ,  12   b  when first and second inflatable members  12   a ,  12   b  are inflated to the desired pressure. That is, sheet  42  prevents first and second inflatable members  12   a ,  12   b  from moving side-to-side (or laterally) relative to one another when inflated to the desired pressure. Additionally, sheet  42  prevents first and second inflatable members  12   a ,  12   b  from moving away from one another when inflated to the desired pressure. While sheet  42  is shown as a single sheet of material extending around the perimeter of first and second inflatable members  12   a ,  12   b , it will be understood that in various embodiments, sheet  42  may be made of more than one sheet of material (e.g., 2 sheets, 3 sheets, 4 sheets, 5, sheets, or more) without departing from the scope of the disclosure. Additionally, in various embodiments, for example only and without limitation, the multiple sheets may be discontinuous from one another. That is, connecting member  40  may comprise two separate sheets with one on each opposite side of inflatable plyometric box  10  or four separate sheets with one on each side of inflatable plyometric box. 
     Sheet  42  may be constructed of a variety of materials known in the art, including but not limited to, polyester, polyurethane, vinyl, polyvinyl chloride (PVC), neoprene, other synthetic or natural materials known in the art, or any combination thereof. For example only and without limitation, sheet  42  may be made of 1000 denier polyester fabric; however stronger or weaker fabrics may be used without departing from the scope of the present disclosure. Sheet  42  may be adhered or fused to first and second inflatable members  12   a ,  12   b  in a variety of ways known in the art, including but not limited to, adhesives, stitching, radiofrequency (RF) welding, heat welding, or any combination thereof. 
     Standard plyometric boxes range in size from about 6 inches tall to about 48 inches tall and many are sold in set sizes, such as, for example, 6 inches tall, 12 inches tall, 18 inches tall, 20 inches tall, 24 inches tall, 30 inches tall, 36 inches tall, 40 inches tall, 42 inches tall, and 48 inches tall. It will be understood that inflatable plyometric box  10  can be made to any desired height H (see  FIG. 1 ). For example only and without limitation, various embodiments of inflatable plyometric box  10  may have a height from about 6 inches (about 15.24 cm) to about 48 inches (about 121.92 cm) (e.g., about 6 inches (about 15.24 cm), about 12 inches (about 30.48 cm), about 15 inches (about 38.1 cm), about 18 inches (about 45.72 cm), about 20 inches (about 50.8 cm), about 24 inches (about 60.96 cm), about 30 inches (about 76.2 cm), about 36 inches (about 91.44 cm), about 40 inches (about 101.6 cm), about 42 inches (about 106.68), about 48 inches (about 121.92 cm)). In certain embodiments, for example only and without limitation, inflatable plyometric box  10  may have a height equal to or greater than about 15 inches (about 38.1 cm). In other embodiments, for example only and without limitation, inflatable plyometric box  10  may have a height equal to or greater than about 20 inches (about 50.8 cm). In other embodiments, for example only and without limitation, inflatable plyometric box  10  may have a height equal to or greater than about 24 inches (about 60.96 cm). In yet other embodiments, for example only and without limitation, inflatable plyometric box  10  may have a height equal to or greater than about 30 inches (about 76.2 cm). In yet other embodiments, for example only and without limitation, inflatable plyometric box  10  may have a height equal to or greater than about 48 inches (121.92 cm). In yet other embodiments, for example only and without limitation, inflatable plyometric box  10  may have a height from about 15 inches (about 38.1 cm) to about 30 inches (about 76.2 cm). In various embodiments, for example only and without limitation, inflatable plyometric box  10  may be produced in heights of about 15 inches (about 38.1 cm), about 20 inches (about 50.8 cm), about 24 inches (about 60.96 cm), and about 30 inches (about 76.2 cm). It will be understood that each of the preceding recited height H dimensions are the height of inflatable plyometric box  10  when first and second inflatable members  12   a ,  12   b  are inflated. For example only and without limitation, inflatable plyometric box  10  may have the preceding recited height H dimensions when first and second inflatable members  12   a ,  12   b  are inflated to a pressure of about 15 psi (about 103.421 kPa). 
     Inflatable plyometric box  10  may have a length L and width W (see  FIG. 2 ) of a sufficient size to permit a user to land with both feet on the top  13  of inflatable plyometric box  10 . Additionally, inflatable plyometric box  10  may have a length L and width W that are substantially equal or equal. As such, the bottom  11  and top  13  of inflatable plyometric box  10  may be substantially square. In certain embodiments, the length L and width W of inflatable plyometric box  10  may be substantially equal or equal to the height H of inflatable plyometric box  10 . In other embodiments for example only and without limitation, inflatable plyometric box  10  may have a height H which is greater than its length L and/or width W. In yet other embodiments, however, for example only and without limitation, inflatable plyometric box  10  may have a length L and width W which are different. Thus, inflatable plyometric box  10  may have a length L greater than its width W. As such, the bottom  11  and top  13  of inflatable plyometric box  10  may be substantially rectangular. Additionally, for example only and without limitation, inflatable plyometric box  10  may be shaped like a rectangular prism without departing from the scope of the disclosure. 
     In various embodiments, for example only and without limitation, inflatable plyometric box  10  may have a length L from about 20 inches (about 50.8 cm) to about 48 inches (about 121.92 cm) (e.g., about 20 inches (about 50.8 cm), about 22 inches (about 55.88 cm), about 24 inches (about 60.96 cm), about 26 inches (66.04 cm), about 28 inches (about 71.12 cm), about 30 inches (about 76.2 cm), about 32 inches (about 81.28 cm), about 34 inches (about 86.36 cm), about 36 inches (about 91.44 cm), about 38 inches (about 101.6 cm), about 40 inches (about 101.6 cm), about 42 inches (about 106.68 cm), about 46 inches (about 116.84 cm), about 48 inches (about 121.92 cm)) and may have a width W from about 20 inches (about 50.8 cm) to about 48 inches (about 121.92 cm) (e.g., about 20 inches (about 50.8 cm), about 22 inches (about 55.88 cm), about 24 inches (about 60.96 cm), about 26 inches (66.04 cm), about 28 inches (about 71.12 cm), about 30 inches (about 76.2 cm), about 32 inches (about 81.28 cm), about 34 inches (about 86.36 cm), about 36 inches (about 91.44 cm), about 38 inches (about 101.6 cm), about 40 inches (about 101.6 cm), about 42 inches (about 106.68 cm), about 46 inches (about 116.84 cm), about 48 inches (about 121.92 cm)). 
     In other embodiments, for example only and without limitation, inflatable plyometric box  10  may have a length L from about 24 inches (about 60.96 cm) to about 36 inches (about 91.4 cm) (e.g., about 24 inches (about 60.96 cm), about 26 inches (66.04 cm), about 28 inches (about 71.12 cm), about 30 inches (about 76.2 cm), about 32 inches (about 81.28 cm), about 34 inches (about 86.36 cm), about 36 inches (about 91.44 cm)) and may have a width W from about 24 inches (about 60.96 cm) to about 36 inches (about 91.4 cm) (e.g., about 24 inches (about 60.96 cm), about 26 inches (66.04 cm), about 28 inches (about 71.12 cm), about 30 inches (about 76.2 cm), about 32 inches (about 81.28 cm), about 34 inches (about 86.36 cm), about 36 inches (about 91.44 cm)). In other embodiments, for example only, inflatable plyometric box  10  has a length L of about 24 inches (about 60.96 cm) and a width W of about 24 inches (about 60.96 cm). In yet other embodiments, for example only and without limitation, inflatable plyometric box  10  has a length L of about 36 inches (about 60.96 cm) and a width W of about 36 inches (about 60.96 cm). 
     It will be understood that each of the preceding recited length L and width W dimensions are the length L and width W of inflatable plyometric box  10  when first and second inflatable members  12   a ,  12   b  are inflated. For example only and without limitation, inflatable plyometric box  10  may have the preceding recited length L and width W dimensions when first and second inflatable members  12   a ,  12   b  are inflated to a pressure of about 15 psi (about 103.421 kPa). 
     With continued reference to  FIG. 2 , in certain embodiments, inflatable plyometric box  10  has a length L which is no more than about 2 times its width W. In other embodiments, in certain embodiments, inflatable plyometric box  10  has a length L which is no more than about 1.5 times its width W. In yet other embodiments, inflatable plyometric box  10  has a length L which is no more than about 1 times its width W. 
     In various embodiments, first and second inflatable members  12   a ,  12   b  have the same height when inflated to their desired pressures. In other embodiments, for example only and without limitation, first inflatable member  12   a  and second inflatable member  12   b  may have different heights when inflated to their desired pressure (e.g., first inflatable member  12   a  may be shorter or taller than second inflatable member  12   b ). Thus it will be understood that first and second inflatable members  12   a ,  12   b  may have the same or different heights when inflated to their desired pressures, or any combination thereof, without departing from the scope of the disclosure. 
     For example only and without limitation, inflatable plyometric box  10  has a length L of about 24 inches (about 60.96 cm), a width W of about 24 inches (about 60.96 cm) and a height H of about 24 inches (about 60.96 cm). 
     As described above in greater detail, the population of drop stitch threads  18   a ,  18   b  in first and second inflatable members  12   a ,  12   b , respectively, make first and second inflatable members  12   a ,  12   b  substantially rigid. Accordingly, when a user jumps upon the central portion of second upper surface  16   b  of second inflatable member  12   b , inflatable plyometric box  10  supports the user jumping on inflatable plyometric box  10  and is compressed no more than about 5% in height H. Stated differently, one or both of first and second inflatable members  12   a ,  12   b  do not compress such that the height H of inflatable plyometric box  10  is decreased by more than about 5%. That is, when a user jumps upon the central portion of second upper surface  16   b  of second inflatable member  12   b  the single or combined compression of first and second inflatable members  12   a ,  12   b  does not exceed about 5% of the height H of inflatable plyometric box  10 . In other embodiments, for example only and without limitation, when a user jumps upon the central portion of second upper surface  16   b  of second inflatable member  12   b , inflatable plyometric box  10  is compressed no more than about 4% in height H. In other embodiments, for example only and without limitation, when a user jumps upon the central portion of second upper surface  16   b  of second inflatable member  12   b , inflatable plyometric box  10  is compressed no more than about 3% in height H. In other embodiments, for example only and without limitation, when a user jumps upon the central portion of second upper surface  16   b  of second inflatable member  12   b , inflatable plyometric box  10  is compressed no more than 2% in height H. In other embodiments, for example only and without limitation, when a user jumps upon the central portion of second upper surface  16   b  of second inflatable member  12   b , inflatable plyometric box  10  is compressed no more than about 1% in height H. In other embodiments, for example only and without limitation, when a user jumps upon the central portion of second upper surface  16   b  of second inflatable member  12   b , inflatable plyometric box  10  is compressed no more than about 0.5% in height H. 
     Additionally, while inflatable plyometric box  10  is shown as having two inflatable members, it will be understood that other embodiments of inflatable plyometric boxes may have more than two inflatable members stacked upon one another (e.g., 3 inflatable members, 4 inflatable members, 5 inflatable members, 6 inflatable members, 7 inflatable members, 8 inflatable members, 9 inflatable members, 10 inflatable members, or more), without departing from the scope of the disclosure. 
     Another embodiment of an inflatable plyometric box  110  is illustrated in  FIGS. 4 and 5  and is described below. Some features of inflatable plyometric box  110  and  10  are common to one another and, accordingly, descriptions of such features in one embodiment should be understood to apply to other embodiments. Furthermore, particular characteristics and aspects of one embodiment may be used in combination with, or instead of, particular characteristics and aspects of another embodiment. 
     Inflatable plyometric box  110  is identical to inflatable plyometric box  10  except that it further includes one or more coupling elements  36   a  affixed to first lower surface  14   a  of first inflatable member  12   a  and one or more coupling elements  36   b  affixed to second upper surface  16   b  of second inflatable member  12   b . Thus, inflatable plyometric box  110  comprises first inflatable member  12   a , second inflatable member  12   b  located above first inflatable member  12   a , and connecting member  40  which is connected to first inflatable member  12   a  and second inflatable member  12   b.    
     Coupling elements  36   a ,  36   b  may comprise strips of hook-and-loop style fasteners (e.g., Velcro®-brand fasteners) which may be affixed to first lower surface  14   a  of first inflatable member  12   a  and second upper surface  16   b  of second inflatable member  12   b . In various embodiments, for example only and without limitation, coupling elements  36   a ,  36   b  may be adhered, fused, sewn and/or otherwise affixed to first lower surface  14   a  of first inflatable member  12   a  and second upper surface  16   b  of second inflatable member  12   b . While coupling elements  36   a ,  36   b  are described as hook-and-loop style fasteners, it will be understood that other types of fasteners may be used as coupling elements without departing from the scope of the disclosure. For example only and without limitation, in various embodiments, coupling elements may comprise one or more magnets, buckles, slidingly engaging fasteners, or any other type of interlocking fasteners known in the art. 
     Coupling elements  36   a ,  36   b  allow plyometric box  110  to be coupled to various objects, surfaces, and/or other plyometric boxes. For example, coupling elements  36   a ,  36   b  may fasten with corresponding coupling elements on an additional inflatable or non-inflatable plyometric box to increase the height that a user must jump. Additionally, coupling elements  36   a ,  36   b  may fasten with corresponding coupling elements on a floor in order to securely fasten inflatable plyometric box  110  to the floor such that it does not move during use. Furthermore, coupling elements  36   a ,  36   b  may fasten to a base to increase the stability of inflatable plyometric box  110  (see, e.g., inflatable plyometric box  210  described below). 
     Additionally, while coupling elements  36   a ,  36   b  are shown on both first lower surface  14   a  of first inflatable member  12   a  and second upper surface  16   b  of second inflatable member  12   b , in other embodiments of inflatable plyometric box, coupling elements are only included on one side of inflatable plyometric box. That is, for example, an embodiment of inflatable plyometric box may only include coupling elements  36   a  on the first lower surface  14   a  of first inflatable member  12   a , leaving second upper surface  16   b  of second inflatable member  12   b  with no coupling elements. Alternatively, for example, another embodiment of inflatable plyometric box may only include coupling elements  36   b  on the second upper surface  16   b  of second inflatable member  12   b , leaving first lower surface  14   a  of first inflatable member  12   a  with no coupling elements. Therefore, coupling elements may optionally be included on one or both sides of inflatable plyometric box. 
     Another embodiment of an inflatable plyometric box  210  is illustrated in  FIGS. 6 and 7  and is described below. Some features of inflatable plyometric box  210 ,  110  and  10  are common to one another and, accordingly, descriptions of such features in one embodiment should be understood to apply to other embodiments. Furthermore, particular characteristics and aspects of one embodiment may be used in combination with, or instead of, particular characteristics and aspects of another embodiment. 
     Inflatable plyometric box  210  comprises first inflatable member  12   a , second inflatable member  12   b  located above first inflatable member  12   a , and connecting member  40  which is connected to first inflatable member  12   a  and second inflatable member  12   b . Inflatable plyometric box  210  further comprises one or more stabilizing members  60  connected to first lower surface  14   a  of first inflatable member  12   a . The one or more stabilizing members  60  serve to increase the stability of inflatable plyometric box  210 . That is, the one or more stabilizing members  60  reduce or eliminate the possibility of inflatable plyometric box  210  tipping over when a user lands upon inflatable plyometric box  210 . 
     In this embodiment for example only and without limitation, stabilizing member  60  comprises base  62  which is connected to first lower surface  14   a  of first inflatable member  12   a . Base  62  has substantially the same surface area as first lower surface  14   a  and thus is substantially the same shape as first lower surface  14   a . In other embodiments, for example only and without limitation, base  62  may have a surface area greater than first lower surface  14   a  such that base  62  extends beyond first lower surface  14   a . In yet other embodiments, for example only and without limitation, base  62  may have a surface area less than first lower surface  14   a . Base  62  may be constructed of a rigid material, including but not limited to, plastic, metal, wood, composites (e.g., carbon fiber, Kevlar®, fiberglass), and/or any combination thereof. 
     Stabilizing member  60  may optionally further include one or more compliance members  64  connected to base  62  opposite first lower surface  14   a . Thus, when placed on a floor, compliance members  64  contact the floor. Compliance members  64  are able to deform slightly such that inflatable plyometric box  110  can rest stably on an uneven or un-level floor. As shown in  FIG. 7 , compliance members  64  comprise four bumpers or feet located proximate the corners of base  62 . 
     Similar to inflatable plyometric box  110 , inflatable plyometric box  210  includes one or more coupling elements  36   a  affixed to first lower surface  14   a  of first inflatable member  12   a . Stabilizing member  60  further may include one or more corresponding coupling elements  38   a  affixed to base  62  which fasten to coupling elements  36   a . Accordingly, stabilizing member  60  may be releasably connected to first lower surface  14   a . As such, stabilizing member  60  may be removed from inflatable plyometric box  210  when a user desires to transport or store inflatable plyometric box  210 . Additionally, in various embodiments, for example only and without limitation, stabilizing member  60  may fold up, thus reducing the size of stabilizing member  60  for transport or storage. Although, stabilizing member  60  is described as being releasably connected to inflatable plyometric box  210 , it will be understood that in various embodiments, stabilizing member  60  may be permanently connected to inflatable plyometric box  210  without departing from the scope of the disclosure. 
     Although not shown, it will be understood that in various embodiments, inflatable plyometric box  210  may further include one or more coupling elements  36   b  affixed to second upper surface  16   b  of second inflatable member  12   b , as shown in  FIGS. 4 and 5 , without departing from the scope of the disclosure. 
     Another embodiment of an inflatable plyometric box  310  is illustrated in  FIGS. 8 and 9  and is described below. Some features of inflatable plyometric box  310 ,  210 ,  110 , and  10  are common to one another and, accordingly, descriptions of such features in one embodiment should be understood to apply to other embodiments. Furthermore, particular characteristics and aspects of one embodiment may be used in combination with, or instead of, particular characteristics and aspects of another embodiment. 
     Inflatable plyometric box  310  is identical to inflatable plyometric box  210 , except for stabilizing member  360  which is different from stabilizing member  60 . Thus, inflatable plyometric box  310  comprises first inflatable member  12   a , second inflatable member  12   b  located above first inflatable member  12   a , and connecting member  40  which is connected to first inflatable member  12   a  and second inflatable member  12   b . Inflatable plyometric box  310  further comprises stabilizing member  360  connected to first lower surface  14   a  of first inflatable member  12   a . Stabilizing member  360  serves to increase the stability of inflatable plyometric box  310 . That is, stabilizing member  360  reduces or eliminates the possibility of inflatable plyometric box  310  tipping over when a user lands upon inflatable plyometric box  310 . 
     In this embodiment for example only and without limitation, stabilizing member  360  comprises base  62  and compliance member  364  attached or adhered to base  62  opposite first lower surface  14   a . Compliance member  364  comprises a thin layer of foam rubber or similar compliant material which, when inflatable plyometric box  310  is placed on a floor, compliance member  364  contacts the floor and is able to deform slightly such that inflatable plyometric box  310  can rest stably on an uneven or un-level floor. Stabilizing member  360  may further include a protective covering  366  over base  62  and compliance member  364 . This protective covering may be rubber, vinyl, PVC or other material known in the art and may also include an anti-skid or non-slip surface to reduce or eliminate the possibility of inflatable plyometric box  310  moving along the floor during use. 
     Similar to inflatable plyometric boxes  110  and  210 , inflatable plyometric box  310  includes one or more coupling elements  36   a  affixed to first lower surface  14   a  of first inflatable member  12   a . Stabilizing member  360  further may include one or more corresponding coupling elements  38   a  affixed thereto which fasten to coupling elements  36   a . Accordingly, stabilizing member  360  may be releasably connected to first lower surface  14   a . As such, stabilizing member  360  may be removed from inflatable plyometric box  310  when a user desires to transport or store inflatable plyometric box  310 . Additionally, in various embodiments, for example only and without limitation, stabilizing member  360  may fold up, thus reducing the size of stabilizing member  360  for transport or storage. Although, stabilizing member  360  is described as being releasably connected to inflatable plyometric box  310 , it will be understood that in various embodiments, stabilizing member  360  may be permanently connected to inflatable plyometric box  310  without departing from the scope of the disclosure. 
     Although not shown, it will be understood that in various embodiments, inflatable plyometric box  310  may further include one or more coupling elements  36   b  affixed to second upper surface  16   b  of second inflatable member  12   b , as shown in  FIGS. 4 and 5 , without departing from the scope of the disclosure. 
     Another embodiment of an inflatable plyometric box  410  is illustrated in  FIGS. 10 and 11  and is described below. Some features of inflatable plyometric box  410 ,  310 ,  210 ,  110 , and  10  are common to one another and, accordingly, descriptions of such features in one embodiment should be understood to apply to other embodiments. Furthermore, particular characteristics and aspects of one embodiment may be used in combination with, or instead of, particular characteristics and aspects of another embodiment. 
     Inflatable plyometric box  410  which further includes one or more stabilizing members  460  which are integrally formed into inflatable plyometric box  410 . Inflatable plyometric box  410  is identical to inflatable plyometric box  10 , except for first inflatable member  412   a  which is different from first inflatable member  12   a . Thus, inflatable plyometric box  410  comprises first inflatable member  412   a , second inflatable member  12   b  located above first inflatable member  412   a , and connecting member  40  which is connected to first inflatable member  412   a  and second inflatable member  12   b.    
     First inflatable member  412   a  is substantially similar to first inflatable member  12   a  except for the inclusion of a stabilizing member  460  integrally formed into first lower surface  414   a  of first inflatable member  412   a . That is, first inflatable member  412   a  includes a first lower surface  414   a , a first upper surface  16   a , a population of drop stitch threads  18   a  connected to and extending there between, and a first sidewall  20   a  extending around the perimeter of both first lower surface  414   a  and first upper surface  16   a . Additionally, as described in greater detail elsewhere herein, first inflatable member  412   a  may include first lower and upper strips  30   a ,  32   a.    
     Differing from first lower surface  14   a  of inflatable plyometric box  10 , first lower surface  414   a  of inflatable plyometric box  410  includes a first lower inner surface  411   a , a first lower outer surface  415   a , and a stabilizing member  460  sandwiched there between. Stabilizing member  460  serves to increase the stability of inflatable plyometric box  410 . That is, stabilizing member  460  reduces or eliminates the possibility of inflatable plyometric box  410  tipping over when a user lands upon inflatable plyometric box  410 . 
     For example only and without limitation, first lower inner surface  411   a  may be a sheet of PVC or polyester fabric and first lower outer surface  415   a  may be a sheet of PVC or polyester fabric. Stabilizing member  460  comprises base  462 . Base  462  may be constructed of a rigid material, including but not limited to, plastic, metal, wood, composites (e.g., carbon fiber, Kevlar®, fiberglass), and/or any combination thereof. Base  462  may be substantially similar in shape to first lower inner and outer surfaces  411   a ,  415   a ; however base  462  may have a surface area slightly less than that of first lower inner and outer surfaces  411   a ,  415   a , such that the perimeters of first lower inner and outer surfaces  411   a ,  415   a  extend beyond base  462 . Base  462  may be adhered on its top side to first lower inner surface  411   a  and adhered on its bottom side to first lower outer surface  415   a . The perimeter of first lower inner surface  411   a  may then be adhered or fused to the perimeter of first lower outer surface  415   a , thus fully encapsulating base  462  within first lower inner and outer surfaces  411   a ,  415   a . By adhering base  462  to both first lower inner and outer surfaces  411   a ,  415   a , relative movement of base  462  and first lower inner and outer surfaces  411   a ,  415   a  is eliminated. This may increase the stability of inflatable plyometric box  410 . 
     Another embodiment of an inflatable plyometric box  510  is illustrated in  FIGS. 12 and 13  and is described below. Some features of inflatable plyometric box  510 ,  410 ,  310 ,  210 ,  110  and  10  are common to one another and, accordingly, descriptions of such features in one embodiment should be understood to apply to other embodiments. Furthermore, particular characteristics and aspects of one embodiment may be used in combination with, or instead of, particular characteristics and aspects of another embodiment. 
     Inflatable plyometric box  510  comprises inflatable plyometric box  10  which is inside protective cover  570 . Protective cover  570  includes a top side  572 , a bottom side  574  and a population of side panels  576  connected to the top and bottom sides  572 ,  574  to define an enclosed space into which inflatable plyometric box  10  may fit. Protective cover  570  may further include a zipper  578  located in one or more of the population of side panels  576  which can be unzipped to permit placing inflatable plyometric box  10  into protective cover  570 . Zipper  578  may extend around three sides of protective cover  570 ; however, it will be understood that zipper  578  may be placed in any location on protective cover  570  which permits inflatable plyometric box  10  into protective cover  570 . Additionally, while protective cover  570  is shown as having zipper  578 , in various embodiments, for example only and without limitation, zipper  578  may be replaced with buttons and corresponding button holes, snaps, hook-and-loop style fasteners, magnets, buckles, slidingly engaging fasteners, or any other type of interlocking fasteners. 
     Protective cover  570  further includes a stabilizing member  560  located within protective cover  570  proximate the interior surface of bottom side  574  of protective cover  570 . Thus, stabilizing member  560  is shown as being sandwiched between bottom side  574  of protective cover  570  and inflatable plyometric box  10 . Stabilizing member  560  comprises base  562 . Base  562  may be constructed of a rigid material, including but not limited to, plastic, metal, wood, composites (e.g., carbon fiber, Kevlar®, fiberglass), and/or any combination thereof. In various embodiments, base  562  may be adhered or affixed to the interior surface of bottom side  574  of protective cover  570 . In other embodiments, for example only and without limitation, base  562  may be placed inside protective cover  570  against the interior surface of bottom side  574  and inflatable plyometric box  10  is then placed inside protective cover  570  and against base  562 . In such embodiments, base  562  is held in place by being sandwiched between bottom side  574  of protective cover  570  and inflatable plyometric box  10 . Accordingly, base  562  need not be adhered or affixed to protective cover  570 . 
     Protective cover  570  provides a layer of protection over inflatable plyometric box  10  which can be placed therein. Instead of a user jumping and landing upon second upper surface  16   b  of inflatable plyometric box  10 , the user jumps and lands upon protective cover  570 . Thus, protective cover  570  may protect inflatable plyometric box  10  therein from wear and/or puncture, thus increasing the useful life of inflatable plyometric box  10 . 
     In various embodiments, protective cover  570  may further optionally include one or more coupling elements  36   a ,  36   b  as described in greater detail elsewhere herein. As shown in  FIGS. 12 and 13 , for example only and without limitation, coupling elements  36   a ,  36   b  may be affixed to the bottom and top sides  574 ,  572 , respectively. 
     Another embodiment of an inflatable plyometric box  610  is illustrated in  FIG. 14  and is described below. Some features of inflatable plyometric box  610 ,  510 ,  410 ,  310 ,  210 ,  110  and  10  are common to one another and, accordingly, descriptions of such features in one embodiment should be understood to apply to other embodiments. Furthermore, particular characteristics and aspects of one embodiment may be used in combination with, or instead of, particular characteristics and aspects of another embodiment. 
     Inflatable plyometric box  610  is identical to inflatable plyometric box  10  except that it further includes stabilizing member  660  attached to first lower surface  14   a  of first inflatable member  12   a . Thus, inflatable plyometric box  610  comprises first inflatable member  12   a , second inflatable member  12   b  located above first inflatable member  12   a , and connecting member  40  which is connected to first inflatable member  12   a  and second inflatable member  12   b.    
     As stated previously, inflatable plyometric box  610  includes stabilizing member  660  which serves to increase the stability of inflatable plyometric box  610 . That is, stabilizing member  660  reduces or eliminates the possibility of inflatable plyometric box  610  tipping over when a user lands upon inflatable plyometric box  610 . In this embodiment for example only and without limitation, stabilizing member  660  comprises base  62  and may optionally include one or more compliance members  64  connected to base  62  opposite first lower surface  14   a , as described in greater detail elsewhere herein. Stabilizing member  660  further comprises one or more straps  668  which are adapted to attach or affix base  62  to first and second inflatable members  12   a ,  12   b . Straps  668  extend over second upper surface  16   b  of second inflatable member  12   b , down along connecting member  40 , under base  62  and back up connecting member  40 . Straps  668  are tightened to press and hold base  62  against first lower surface  14   a  of first inflatable member. Thus, straps  668  extend around the top of first and second inflatable bases  12   a ,  12   b  and are tightened to securely attach base  62  of stabilizing member  660  to first and second inflatable bases  12   a ,  12   b.    
     Although, stabilizing member  660  is shown having base  62  and compliance members  64 , it will be understood that in other embodiments for example and without limitation, a stabilizing member  660  may be substantially similar to stabilizing member  360  (see  FIGS. 8 and 9 ) without departing from the scope of the invention. That is, in various embodiments, stabilizing member  660  may include base  62  and a compliance member, like compliance member  364 , such as a thin layer of foam rubber or similar compliant material, which is strapped to first and second inflatable members  12   a ,  12   b  using straps  668 . Like stabilizing member  360 , in various embodiments, stabilizing member  660  may include a protective covering like protective covering  366  which covers base  62  and the compliance member. 
     Another embodiment of an inflatable plyometric box  710  is illustrated in  FIGS. 15 and 16  and is described below. Some features of inflatable plyometric box  710 ,  610 ,  510 ,  410 ,  310 ,  210 ,  110  and  10  are common to one another and, accordingly, descriptions of such features in one embodiment should be understood to apply to other embodiments. Furthermore, particular characteristics and aspects of one embodiment may be used in combination with, or instead of, particular characteristics and aspects of another embodiment. 
     Inflatable plyometric box  710  is an expandable inflatable plyometric box which includes three inflatable members stacked upon one another, wherein the middle or third inflatable member may be inflated or deflated to change the height of inflatable plyometric box. Therefore, a user may use a single inflatable plyometric box  710  and expand it to different heights as desired without needing two separate plyometric boxes at two different heights.  FIG. 15  shows the third inflatable member of inflatable plyometric box  710  deflated such that inflatable plyometric box  710  is in a non-expanded state and  FIG. 16  shows the third inflatable member of inflatable plyometric box  710  inflated such that inflatable plyometric box  710  is in an expanded state. 
     Inflatable plyometric box  710  thus includes a first inflatable member  12   a , a second inflatable member  12   b , a third inflatable member  12   c  and a connecting member  740  which is connected to first inflatable member  12   a  and second inflatable member  12   b . Third inflatable member  12   c  has substantially similar or identical construction as first and second inflatable members  12   a ,  12   b  as described in greater detail elsewhere herein. Like first and second inflatable members  12   a ,  12   b , third inflatable member  12   c  has an enclosed interior or chamber which is adapted to be airtight and hold air (or any gas) at a desired pressure. Additionally, third inflatable member  12   c  incorporates drop stitch technology which allows third inflatable member  12   c  to hold air (or any gas) at higher pressures and provides a high degree of rigidity to third inflatable member  12   c . Again, like first and second inflatable members  12   a ,  12   b , third inflatable member  12   c  has an inflation valve  34   c  through which air (or any gas) may be directed to inflate third inflatable member  12   c.    
     As shown in  FIGS. 15 and 16 , connecting member  740  of inflatable plyometric box  710  includes a zipper  778  which extends around the sides of connecting member  740 . Connecting member  740  and zipper  778  function the same as the expandable sections of expandable luggage as known in the art. The user closes or zips zipper  778  when they desire to use inflatable plyometric box  710  at a first, shorter height and the user opens or unzips zipper  778  when they desire to use inflatable plyometric box  710  at a second, taller height. Therefore, opening and closing zipper  778  enables expansion and contraction of connecting member  740 . Connecting member  740  includes a hole  741  through which inflation valve  34   c  of third inflatable member  12   c  can be accessed for inflating third inflatable member  12   c.    
     As shown in  FIG. 15 , third inflatable member  12   c  is deflated, first and second inflatable members  12   a ,  12   b  are inflated to the desired pressure, and zipper  778  is closed. In this configuration, first and second inflatable members  12   a ,  12   b  are held against the deflated third inflatable member  12   c  by connecting member  740 . Thus, connecting member  740  prevents relative movement between first and second inflatable members  12   a ,  12   b  when first and second inflatable members  12   a ,  12   b  are inflated to the desired pressure. That is, connecting member  740  prevents first and second inflatable members  12   a ,  12   b  from moving side-to-side (or laterally) relative to one another when inflated to the desired pressure. Additionally, connecting member  740  prevents first and second inflatable members  12   a ,  12   b  from moving away from one another when inflated to the desired pressure. Inflatable plyometric box  710  is thus is at a first, shorter height and can jumped on by a user engaging in physical activity or exercise. 
     As shown in  FIG. 16 , zipper  778  is opened or unzipped and all three of first, second and third inflatable members  12   a ,  12   b ,  12   c  are inflated to the desired pressure. In this configuration, first and second inflatable members  12   a ,  12   b  are held against the inflated third inflatable member  12   c  by connecting member  740 . Thus, connecting member  740  prevents relative movement between first, second and third inflatable members  12   a ,  12   b ,  12   c  when first, second and third inflatable members  12   a ,  12   b ,  12   c  are inflated to the desired pressure. That is, connecting member  740  prevents first, second and third inflatable members  12   a ,  12   b ,  12   c  from moving side-to-side (or laterally) relative to one another when inflated to the desired pressure. Additionally, connecting member  740  prevents first, second and third inflatable members  12   a ,  12   b ,  12   c  from moving away from one another when inflated to the desired pressure. Inflatable plyometric box  710  is thus is at a second, taller height and can jumped on by a user engaging in physical activity or exercise. 
     In various embodiments, inflatable plyometric box  710  may further optionally include one or more coupling elements  36   a ,  36   b  as described in greater detail elsewhere herein without departing from the scope of the present disclosure. 
     Although not shown, it will be understood that inflatable plyometric box  710  may optionally include any of the stabilizing members  60 ,  360 ,  660  described herein without departing from the scope of the disclosure. Additionally, in various embodiments, inflatable plyometric box  710  may include a built-in stabilizing member similar to stabilizing member  460  of inflatable plyometric box  410 , without departing from the scope of the disclosure. 
     In various embodiments, first, second and third inflatable members  12   a ,  12   b ,  12   c  are identical. For example only and without limitation, first, second and third inflatable members  12   a ,  12   b ,  12   c  may all have the same height when inflated to their desired pressures. In other embodiments, for example only and without limitation, first and second inflatable members  12   a ,  12   b  may have the same height when inflated to their desired pressures and third inflatable member  12   c  may have a different height when inflated to its desired pressure (e.g., third inflatable member  12   c  may be shorter or taller than first and second inflatable members  12   a ,  12   b ). In yet other embodiments, for example only and without limitation, first and third inflatable members  12   a ,  12   c  may have the same height when inflated to their desired pressures and second inflatable member  12   b  may have a different height when inflated to its desired pressure (e.g., second inflatable member  12   b  may be shorter or taller than first and third inflatable members  12   a ,  12   c ). In yet other embodiments, for example only and without limitation, second and third inflatable members  12   b ,  12   c  may have the same height when inflated to their desired pressures and first inflatable member  12   a  may have a different height when inflated to its desired pressure (e.g., first inflatable member  12   a  may be shorter or taller than second and third inflatable members  12   b ,  12   c ). In yet other embodiments, for example only and without limitation, first, second and third inflatable members  12   a ,  12   b ,  12   c  may each have different heights when inflated to their desired pressures. Thus it will be understood that each of first, second and third inflatable members  12   a ,  12   b ,  12   c  may have the same or different heights when inflated to their desired pressures, or any combination thereof, without departing from the scope of the disclosure. 
     Additionally, while inflatable plyometric box  710  is shown as having three inflatable members, it will be understood that other embodiments of inflatable plyometric boxes may have more than three inflatable members stacked upon one another (e.g., 4 inflatable members, 5 inflatable members, 6 inflatable members, 7 inflatable members, 8 inflatable members, 9 inflatable members, 10 inflatable members, or more), without departing from the scope of the disclosure. 
     Another embodiment of an inflatable plyometric box  810  is illustrated in  FIGS. 17, 18 and 19  and is described below. Some features of inflatable plyometric box  810 ,  710 ,  610 ,  510 ,  410 ,  310 ,  210 ,  110 , and  10  are common to one another and, accordingly, descriptions of such features in one embodiment should be understood to apply to other embodiments. Furthermore, particular characteristics and aspects of one embodiment may be used in combination with, or instead of, particular characteristics and aspects of another embodiment. 
     Inflatable plyometric box  810  is identical to inflatable plyometric box  210 , except for stabilizing member  860  which is different from stabilizing member  60 . Thus, inflatable plyometric box  810  comprises first inflatable member  12   a , second inflatable member  12   b  located above first inflatable member  12   a , and connecting member  40  which is connected to first inflatable member  12   a  and second inflatable member  12   b . Inflatable plyometric box  810  further comprises stabilizing member  860  connected to first lower surface  14   a  of first inflatable member  12   a . Stabilizing member  860  serves to increase the stability of inflatable plyometric box  810 . That is, stabilizing member  860  reduces or eliminates the possibility of inflatable plyometric box  810  tipping over when a user lands upon inflatable plyometric box  810 . 
     In this embodiment for example only and without limitation, stabilizing member  860  comprises box  862  having a bottom  863  and four sides  865  extending upward from bottom  863 . Box  862  has an open top side such that inflatable plyometric box  810  can be inserted into box  862 . Sides  865  of box  862  are shorter in height than the height of inflatable plyometric box  810 . In various embodiments, for example only and without limitation, sides  865  of box  862  have a height less than or equal to about half the height of inflatable plyometric box  810 . In other embodiments, for example only and without limitation, sides  865  of box  862  have a height less than or equal to about a quarter of the height of inflatable plyometric box  810 . In yet other embodiments, for example only and without limitation, sides  865  of box  862  have a height less than or equal to about an eighth of the height of inflatable plyometric box  810 . In various embodiments, for example only and without limitation, sides  865  of box  862  have a height of about 12 inches (about 30.48 cm) or less. In other embodiments, for example only and without limitation, sides  865  of box  862  have a height of about 6 inches (about 15.24 cm) or less. 
     The dimensions of box  862  are such that when inflatable plyometric box  810  is inflated to its desired gas pressure, inflatable plyometric box  810  may have a friction fit inside sides  865  of box  862 . Thus, when inflatable plyometric box  810  is inflated to its desired gas pressure, inflatable plyometric box  810  fits snugly inside box  862 . 
     Similar to inflatable plyometric boxes  110  and  210 , inflatable plyometric box  810  includes one or more coupling elements  36   a  affixed to first lower surface  14   a  of first inflatable member  12   a . Stabilizing member  860  further may include one or more corresponding coupling elements  38   a  affixed thereto which fasten to coupling elements  36   a . Accordingly, stabilizing member  860  may be releasably connected to first lower surface  14   a . As such, stabilizing member  860  may be removed from inflatable plyometric box  810  when a user desires to transport or store inflatable plyometric box  810 . Additionally, in various embodiments, for example only and without limitation, stabilizing member  860  may fold up, thus reducing the size of stabilizing member  360  for transport or storage. In such embodiments, sides  865  may fold down and bottom  863  may also fold. Although, stabilizing member  860  is described as being releasably connected to inflatable plyometric box  810 , it will be understood that in various embodiments, stabilizing member  860  may be permanently connected to inflatable plyometric box  810  without departing from the scope of the disclosure. 
     Although not shown, it will be understood that in various embodiments, inflatable plyometric box  810  may further include one or more coupling elements  36   b  affixed to second upper surface  16   b  of second inflatable member  12   b , as shown in  FIGS. 4 and 5 , without departing from the scope of the disclosure. 
     Additionally, although not shown, it will be understood that in various embodiments, inflatable plyometric box  810  may further include one or more and compliance members (such as for example only compliance members  64  and  364  shown in  FIGS. 6-7 and 8-9 ) attached or adhered to bottom  863  of box  862  opposite first lower surface  14   a  (i.e., opposite the direction that sides  865  extend). 
     Another embodiment of an inflatable plyometric box  910  is illustrated in  FIG. 17  and is described below. Some features of inflatable plyometric box  910 ,  810 ,  710 ,  610 ,  510 ,  410 ,  310 ,  210 ,  110  and  10  are common to one another and, accordingly, descriptions of such features in one embodiment should be understood to apply to other embodiments. Furthermore, particular characteristics and aspects of one embodiment may be used in combination with, or instead of, particular characteristics and aspects of another embodiment. 
     Inflatable plyometric box  910  comprises a single inflatable member  12   a . Thus, while other embodiments of inflatable plyometric boxes described herein have included two or more inflatable members, inflatable plyometric box  910  comprises only one inflatable member which is identical to first inflatable member  12   a.    
     In various embodiments, inflatable plyometric box  910  may further optionally include one or more coupling elements  36   a ,  36   b  as described in greater detail elsewhere herein without departing from the scope of the present disclosure. 
     Although not shown, it will be understood that inflatable plyometric box  910  may optionally include any of the stabilizing members  60 ,  360 ,  660  described herein without departing from the scope of the disclosure. Additionally, in various embodiments, inflatable plyometric box  910  may include a built-in stabilizing member similar to stabilizing member  460  of inflatable plyometric box  410 , without departing from the scope of the disclosure. 
     Inflatable plyometric box  910  may be made to any desired height H (see  FIG. 20 ). For example only and without limitation, various embodiments of inflatable plyometric box  910  may have a height from about 6 inches (about 15.24 cm) to about 48 inches (about 121.92 cm) (e.g., about 6 inches (about 15.24 cm), about 12 inches (about 30.48 cm), about 15 inches (about 38.1 cm), about 18 inches (about 45.72 cm), about 20 inches (about 50.8 cm), about 24 inches (about 60.96 cm), about 30 inches (about 76.2 cm), about 36 inches (about 91.44 cm), about 40 inches (about 101.6 cm), about 42 inches (about 106.68), about 48 inches (about 121.92 cm)). In certain embodiments, for example only and without limitation, inflatable plyometric box  910  may have a height equal to or greater than about 15 inches (about 38.1 cm). In other embodiments, for example only and without limitation, inflatable plyometric box  910  may have a height equal to or greater than about 20 inches (about 50.8 cm). In other embodiments, for example only and without limitation, inflatable plyometric box  910  may have a height equal to or greater than about 24 inches (about 60.96 cm). In yet other embodiments, for example only and without limitation, inflatable plyometric box  910  may have a height equal to or greater than about 30 inches (about 76.2 cm). In yet other embodiments, for example only and without limitation, inflatable plyometric box  910  may have a height equal to or greater than about 48 inches (121.92 cm). In yet other embodiments, for example only and without limitation, inflatable plyometric box  910  may have a height from about 15 inches (about 38.1 cm) to about 30 inches (about 76.2 cm). In various embodiments, for example only and without limitation, inflatable plyometric box  910  may be produced in heights of about 15 inches (about 38.1 cm), about 20 inches (about 50.8 cm), about 24 inches (about 60.96 cm), and about 30 inches (about 76.2 cm). It will be understood that each of the preceding recited height H dimensions are the height of inflatable plyometric box  910  when first inflatable member  12   a  is inflated. For example only and without limitation, inflatable plyometric box  910  may have the preceding recited height H dimensions when first inflatable member  12   a  is inflated to a pressure of about 15 psi (about 103.421 kPa). 
     Inflatable plyometric box  910  may have a length L and width W (see  FIG. 21 ) of a sufficient size to permit a user to land with both feet on the top  913  of inflatable plyometric box  910 . Additionally, inflatable plyometric box  910  may have a length L and width W that are substantially equal or equal. As such, the bottom  911  and top  913  of inflatable plyometric box  910  may be substantially square. In certain embodiments, the length L and width W of inflatable plyometric box  910  may be substantially equal or equal to the height H of inflatable plyometric box  910 . In other embodiments for example, inflatable plyometric box  910  may have a height H which is greater than its length L and/or width W. In yet other embodiments, however, for example only and without limitation, inflatable plyometric box  910  may have a length L and width W which are different. Thus, inflatable plyometric box  910  may have a length L greater than its width W. As such, the bottom  911  and top  913  of inflatable plyometric box  910  may be substantially rectangular. Additionally, for example only and without limitation, inflatable plyometric box  910  may be shaped like a rectangular prism without departing from the scope of the disclosure. 
     In various embodiments, for example only and without limitation, inflatable plyometric box  910  may have a length L from about 20 inches (about 50.8 cm) to about 48 inches (about 121.92 cm) (e.g., about 20 inches (about 50.8 cm), about 22 inches (about 55.88 cm), about 24 inches (about 60.96 cm), about 26 inches (66.04 cm), about 28 inches (about 71.12 cm), about 30 inches (about 76.2 cm), about 32 inches (about 81.28 cm), about 34 inches (about 86.36 cm), about 36 inches (about 91.44 cm), about 38 inches (about 101.6 cm), about 40 inches (about 101.6 cm), about 42 inches (about 106.68 cm), about 46 inches (about 116.84 cm), about 48 inches (about 121.92 cm)) and may have a width W from about 20 inches (about 50.8 cm) to about 48 inches (about 121.92 cm) (e.g., about 20 inches (about 50.8 cm), about 22 inches (about 55.88 cm), about 24 inches (about 60.96 cm), about 26 inches (66.04 cm), about 28 inches (about 71.12 cm), about 30 inches (about 76.2 cm), about 32 inches (about 81.28 cm), about 34 inches (about 86.36 cm), about 36 inches (about 91.44 cm), about 38 inches (about 101.6 cm), about 40 inches (about 101.6 cm), about 42 inches (about 106.68 cm), about 46 inches (about 116.84 cm), about 48 inches (about 121.92 cm)). 
     In other embodiments, for example only and without limitation, inflatable plyometric box  910  may have a length L from about 24 inches (about 60.96 cm) to about 36 inches (about 91.4 cm) (e.g., about 24 inches (about 60.96 cm), about 26 inches (66.04 cm), about 28 inches (about 71.12 cm), about 30 inches (about 76.2 cm), about 32 inches (about 81.28 cm), about 34 inches (about 86.36 cm), about 36 inches (about 91.44 cm)) and may have a width W from about 24 inches (about 60.96 cm) to about 36 inches (about 91.4 cm) (e.g., about 24 inches (about 60.96 cm), about 26 inches (66.04 cm), about 28 inches (about 71.12 cm), about 30 inches (about 76.2 cm), about 32 inches (about 81.28 cm), about 34 inches (about 86.36 cm), about 36 inches (about 91.44 cm)). In other embodiments, for example only, inflatable plyometric box  910  has a length L of about 24 inches (about 60.96 cm) and a width W of about 24 inches (about 60.96 cm). In yet other embodiments, for example only and without limitation, inflatable plyometric box  910  has a length L of about 36 inches (about 60.96 cm) and a width W of about 36 inches (about 60.96 cm). 
     It will be understood that each of the preceding recited length L and width W dimensions are the length L and width W of inflatable plyometric box  910  when first inflatable member  12   a  is inflated. For example only and without limitation, inflatable plyometric box  910  may have the preceding recited length L and width W dimensions when first inflatable member  12   a  is inflated to a pressure of about 15 psi (about 103.421 kPa). 
     With continued reference to  FIG. 21 , in certain embodiments, inflatable plyometric box  910  has a length L which is no more than about 2 times its width W. In other embodiments, in certain embodiments, inflatable plyometric box  910  has a length L which is no more than about 1.5 times its width W. In yet other embodiments, inflatable plyometric box  910  has a length L which is no more than about 1 times its width W. 
     As described above in greater detail, the population of drop stitch threads  18   a  in first inflatable member  12   a  make first inflatable member  12   a  substantially rigid. Accordingly, when a user jumps upon the central portion of first upper surface  16   a  of first inflatable member  12   a , inflatable plyometric box  910  supports the user jumping on inflatable plyometric box  910  and is compressed no more than about 5% in height H. Stated differently, first inflatable member  12   a  does not compress such that the height H of inflatable plyometric box  910  is decreased by more than about 5%. That is, when a user jumps upon the central portion of first upper surface  16   a  of first inflatable member  12   a , the compression of first inflatable member  12   a  does not exceed about 5% of the height H of inflatable plyometric box  910 . In other embodiments, for example only and without limitation, when a user jumps upon the central portion of first upper surface  16   a  of first inflatable member  12   a , inflatable plyometric box  910  is compressed no more than about 4% in height H. In other embodiments, for example only and without limitation, when a user jumps upon the central portion of first upper surface  16   a  of first inflatable member  12   a , inflatable plyometric box  910  is compressed no more than about 3% in height H. In other embodiments, for example only and without limitation, when a user jumps upon the central portion of first upper surface  16   a  of first inflatable member  12   a , inflatable plyometric box  910  is compressed no more than 2% in height H. In other embodiments, for example only and without limitation, when a user jumps upon the central portion of first upper surface  16   a  of first inflatable member  12   a , inflatable plyometric box  910  is compressed no more than about 1% in height H. In other embodiments, for example only and without limitation, when a user jumps upon the central portion of first upper surface  16   a  of first inflatable member  12   a , inflatable plyometric box  910  is compressed no more than about 0.5% in height H. 
     As shown in  FIG. 22 , multiple inflatable members  12   a  may be stacked upon one another and connected, for example via coupling elements  36   a ,  36   b  to increase the height that a user has to jump. 
     Although the first, second and third inflatable members described herein with respect to various embodiments of the inflatable plyometric boxes are described as each first, second and third inflatable member having an inflation valve, it will be understood that in various embodiments, the first, second and/or third inflatable members may be in fluid communication with each other. That is, air (or any gas) may travel freely between each of the inflatable members. In such embodiments, the inflatable plyometric box has a single inflation valve and each inflatable member may be inflated through that single inflation valve. 
       FIGS. 23-25, and 27  depict other embodiments of inflatable plyometric boxes  1010 ,  1110 ,  1210 , and  1310 . Some features of the inflatable plyometric boxes  10 ,  110 ,  210 ,  310 ,  410 ,  510 ,  610 ,  710 ,  810 ,  910 ,  1010 ,  1110 ,  1210 ,  1310  are common to one another and, accordingly, descriptions of such features in one embodiment should be understood to apply to other embodiments. Furthermore, particular characteristics and aspects of one embodiment may be used in combination with, or instead of, particular characteristics and aspects of another embodiment. 
     The inflatable plyometric boxes  1010 ,  1110 ,  1210 , and  1310  can include a first inflatable member  1012   a ,  1112   a ,  1212   a ,  1312   a ; a second inflatable member  1012   b ,  1112   b ,  1212   b ,  1312   b  located above the first inflatable member  1012   a ,  1112   a ,  1212   a ,  1312   a , and a connecting member (e.g., connecting member  1040 ) which is connected to first inflatable member  1012   a ,  1112   a ,  1212   a ,  1312   a  and second inflatable member  1012   a ,  1112   a ,  1212   a ,  1312   a . The connecting member (e.g., connecting member  1040 ) secures or connects first inflatable member  1012   a ,  1112   a ,  1212   a ,  1312   a  to second inflatable member  1012   b ,  1112   b ,  1212   b ,  1312   b . First and second inflatable members  1012   a ,  1112   a ,  1212   a ,  1312   a ,  1012   b ,  1112   b ,  1212   b ,  1312   b  are substantially similar or identical and each have an enclosed interior or chamber which is adapted to be airtight and hold air (or any gas) at a desired pressure. As is described more fully below, each of first and second inflatable members  1012   a ,  1112   a ,  1212   a ,  1312   a ,  1012   b ,  1112   b ,  1212   b ,  1312   b  incorporate drop stitch technology which allows first and second inflatable members  1012   a ,  1112   a ,  1212   a ,  1312   a ,  1012   b ,  1112   b ,  1212   b ,  1312   b  to hold air (or any gas) at higher pressures and provides a high degree of rigidity to each of first and second inflatable members  1012   a ,  1112   a ,  1212   a ,  1312   a ,  1012   b ,  1112   b ,  1212   b ,  1312   b  when first and second inflatable members  1012   a ,  1112   a ,  1212   a ,  1312   a ,  1012   b ,  1112   b ,  1212   b ,  1312   b  are inflated. The inflatable plyometric box  1010 ,  1110 ,  1210 ,  1310  is described herein with second inflatable member  1012   b ,  1112   b ,  1212   b ,  1312   b  being on top of first inflatable member  1012   a ,  1112   a ,  1212   a ,  1312   a . Thus, part of first inflatable member  1012   a ,  1112   a ,  1212   a ,  1312   a  is proximate to and forms the bottom side of inflatable plyometric box  1010 ,  1110 ,  1210 , and  1310  and part of second inflatable member  1012   b ,  1112   b ,  1212   b ,  1312   b  is proximate to and forms the top side of inflatable plyometric box  1010 ,  1110 ,  1210 ,  1310 . However, with first and second inflatable members  1012   a ,  1112   a ,  1212   a ,  1312   a ,  1012   b ,  1112   b ,  1212   b ,  1312   b  being substantially similar or identical, inflatable plyometric box  1010 ,  1110 ,  1210 ,  1310  may be used right side up or upside down. Thus, inflatable plyometric box  1010 ,  1110 ,  1210 ,  1310  may be used with first inflatable member  1012   a ,  1112   a ,  1212   a ,  1312   a  on top of second inflatable member  1012   b ,  1112   b ,  1212   b ,  1312   b.    
     Additionally, while inflatable plyometric box  10  is shown as having two inflatable members, it will be understood that other embodiments of inflatable plyometric boxes may have one inflatable member or more than two inflatable members stacked upon one another (e.g., 1 inflatable members, 3 inflatable members, 4 inflatable members, 5 inflatable members, 6 inflatable members, 7 inflatable members, 8 inflatable members, 9 inflatable members, 10 inflatable members, or more), without departing from the scope of the disclosure. 
       FIGS. 23-28  illustrate various examples of stabilizing members  1060 ,  1160 ,  1260 , and  1360 . The stabilizing members  1060 ,  1160 ,  1260 ,  1360  can include one or more features of the stabilizing members  60 ,  360 ,  460 ,  560 ,  660 , and  860  as previously described herein. The stabilizing member  1060 ,  1160 ,  1260 ,  1360  can include a base  1062 ,  1162 ,  1262 , and  1362  as shown in  FIGS. 23-28  respectively. The base  1062 ,  1162 ,  1262 ,  1362  can interface with the inflatable plyometric box  1010 ,  1110 ,  1210 ,  1310 , such as the first lower surface (e.g., first lower surface  14   a  as shown in the example of  FIG. 3  and other examples herein) of a first inflatable member  1012   a ,  1112   a ,  1212   a ,  1312   a . An upper surface of the stabilizing members  1060 ,  1160 ,  1260 , and  1360  can have a contoured shape, such as a shape that corresponds with the shape of the first lower surface of the first inflatable member  1012   a ,  1112   a ,  1212   a ,  1312   a . In an example, the countered shape can align the stabilizing member  1060 ,  1160 ,  1260 ,  1360  with the inflatable plyometric box  1010 ,  1110 ,  1210 ,  1310 . In a further example, the contoured shape can center the plyometric box  1010 ,  1110 ,  1210 ,  1310  on the respective stabilizing members  1060 ,  1160 ,  1260 , and  1360 . In some instances, the stabilizing members  1060 ,  1160 ,  1260 , and  1360  can be coupled to the inflatable plyometric box  1010 ,  1110 ,  1210 ,  1310 , such as removably coupled as described further herein. stabilizing members  1060 ,  1160 ,  1260 , and  1360  may be constructed of a rigid material, including but not limited to, plastic, metal, wood, composites (e.g., carbon fiber, Kevlar®, fiberglass), and/or any combination thereof. 
     In some examples, the length and width of the stabilizing members  1060 ,  1160 ,  1260 , and  1360  (e.g., the length and width along the first lower surface of the first inflatable member  1012   a ,  1112   a ,  1212   a ,  1312   a ) can be larger the than the length and width of the first lower surface (e.g., lower surface of the first inflatable member  1012   a ,  1112   a ,  1212   a ,  1312   a ), as shown in the examples of  FIGS. 23-25 and 27 . In other examples the stabilizing members  1060 ,  1160 ,  1260 , and  1360  can be smaller than the length or width of the plyometric box  1010 ,  1110 ,  1210 ,  1310  in some dimensions as also shown in  FIGS. 24 and 27 . The stabilizing members  1060 ,  1160 ,  1260 , and  1360  can include a substantially rectangular shape having one or more cutouts  1168 ,  1368  at the corners (as shown in the examples of  FIGS. 27-28 ) or along the sides (as shown in the example of  FIG. 24 ). In an example the stabilizing members  1060 ,  1160 ,  1260 , and  1360  can include a cross shape or an x-shape extended from a center portion  1070 ,  1170   1270 ,  1370  (e.g., rectangular center portion) of the stabilizing members  1060 ,  1160 ,  1260 ,  1360 . For instance, one or more corners or sides of the stabilizing member  1060 ,  1160 ,  1260 ,  1360  can be extended from the center portion  1070 ,  1170   1270 ,  1370  of the stabilizing member  1060 ,  1160 ,  1260 ,  1360 . 
     The stabilizing members  1060 ,  1160 ,  1260 , and  1360  can include respective raised portions  1072 ,  1172 ,  1272 , and  1372 . For instance, the raised portion  1072 ,  1172 ,  1272 ,  1372  can include a ridge along the upper surface  1274 ,  1374  that is configured to engage the inflatable plyometric box  1010 ,  1110 ,  1210 ,  1310 , such as the first lower surface (e.g., first lower surface  1114   a ), the side surface of the inflatable member  1012   a ,  1112   a ,  1212   a ,  1312   a , or a combination thereof. In the examples of  FIGS. 23-24 , the raised portion  1072 ,  1172  can include a flange disposed from one or more corners of the stabilizing member  1060 ,  1160 , such as each of the four corners of the stabilizing member  1060 ,  1160 . In another example, the raised portion  1272  can include a ridge extended along a perimeter of the upper surface as depicted in  FIGS. 25-26 .  FIG. 23  illustrates an example including the raised portion  1072  extended along the perimeter of the upper surface and a flange disposed from the corners of the base  1062 . 
     In some examples, the stabilizing member  1060 ,  1160 ,  1260 ,  1360  can include a pad  1064 ,  1164 ,  1264  to increase friction between the stabilizing member  1060 ,  1160 ,  1260 ,  1360  and the floor or the ground. In various examples, the pad  1064 ,  1164 ,  1264  can be coupled to the stabilizing member  1060 ,  1160 ,  1260 ,  1360  by means including, but not limited to, co-molding, insert molding, fastening (e.g., screws or snap-fits), adhering, or other. In some examples, the pad  1064 ,  1164 ,  1264  can be removably coupled. Accordingly, the pad  1064 ,  1164 ,  1264  can be detached or replaceable. In some examples, the pad  1064 ,  1164 ,  1264  can be a gripping element. For instance, the pad  1064 ,  1164 ,  1264  can be constructed from an elastomer, can be infused with grit, or the like. 
     In another example, the pad  1064 ,  1164 ,  1264  may optionally further include one or more compliance members connected to the base  1062 ,  1162 ,  1262 ,  1362  opposite first lower surface (e.g., lower surface  1114   a ). Thus, when placed on a floor, the pad  1064 ,  1164 ,  1264  can contact the floor. The pad  1064 ,  1164 ,  1264  is able to deform slightly such that inflatable plyometric box  1010 ,  1110 ,  1210 ,  1310  can rest stably on an uneven or un-level floor. 
     As shown in the examples of  FIGS. 23 and 25 , the stabilizing member  1060 ,  1160 ,  1260 ,  1360  can include one or more handholds  1066 ,  1266 . The handholds  1066 ,  1266  can be used for transporting, positioning, or tethering the stabilizing member  1060 ,  1260  or the inflatable plyometric box  1010 ,  1210 . In some examples, the handholds  1066 ,  1266  can include apertures located through the stabilizing member  1060 ,  1260 . 
     The stabilizing member  1060 ,  1160 ,  1260 ,  1360  can be permanently or removably attached to the inflatable plyometric box  1010 ,  1110 ,  1210 ,  1310 , such as the first inflatable member  1012   a ,  1112   a ,  1212   a ,  1312   a  of the inflatable plyometric box  1010 ,  1110 ,  1210 ,  1310 . As shown in the example of  FIG. 23 , the inflatable plyometric box  1010  can include one or more coupling elements  1036 . The coupling elements  1036  can interface and fasten to one or more corresponding coupling elements  1038  attached to the stabilizing member  1060 ,  1160 ,  1260 ,  1360 . In an example the coupling elements  1036  can be affixed to the first inflatable member  1012   a , the connecting member  1040 , protective cover (e.g., protective cover  570 ), or other feature of the inflatable plyometric box  1010 ,  1110 ,  1210 ,  1310 . 
     Accordingly, stabilizing member  1060 ,  1160 ,  1260 ,  1360  may be releasably connected to the inflatable plyometric box  1010 ,  1110 ,  1210 ,  1310  when a user desires to transport or store inflatable plyometric box  1010 ,  1110 ,  1210 ,  1310 . Additionally, in various embodiments, for example only and without limitation, stabilizing member  1060 ,  1160 ,  1260 ,  1360  may fold up, thus reducing the size of stabilizing member  1060 ,  1160 ,  1260 ,  1360  for transport or storage. Although, stabilizing member  1060 ,  1160 ,  1260 ,  1360  is described as being releasably connected to inflatable plyometric box  1010 ,  1110 ,  1210 ,  1310 , it will be understood that in various embodiments, stabilizing member  1060 ,  1160 ,  1260 ,  1360  may be permanently connected to inflatable plyometric box  1010 ,  1110 ,  1210 ,  1310  without departing from the scope of the disclosure. 
     Coupling elements  1036 ,  1038  may comprise strips of hook-and-loop style fasteners (e.g., Velcro®-brand fasteners) which may be affixed to first lower surface (e.g., first lower surface  1114   a ) of first inflatable member (e.g., first inflatable member  1012   a ,  1112   a ,  1212   a ,  1312   a ) or the second upper surface  1016   b ,  1116   a ,  1216   a ,  1316   a  of the second inflatable member  1012   b ,  1112   b ,  1212   b ,  1312   b . In various embodiments, for example only and without limitation, coupling elements  1036  may be adhered, fused, sewn and/or otherwise affixed to the first inflatable member  1012   a ,  1112   a ,  1212   a ,  1312   a  or the second upper surface  1016   b ,  1116   a ,  1216   a ,  1316   a  of second inflatable member  1012   b ,  1112   b ,  1212   b ,  1312   b . While coupling elements  1036 ,  1038  are described as hook-and-loop style fasteners, it will be understood that other types of fasteners may be used as coupling elements without departing from the scope of the disclosure. For example only and without limitation, in various embodiments, coupling elements may comprise one or more magnets, buckles, slidingly engaging fasteners, or any other type of interlocking fasteners known in the art. 
     Although several embodiments of an apparatus, system, and/or method in accordance with present teachings have been described above with a certain degree of particularity, those skilled in the art could make numerous alterations to the disclosed embodiments without departing from the scope of this disclosure. All directional references (e.g., upper, lower, upward, downward, left, right, leftward, rightward, top, bottom, above, below, vertical, horizontal, clockwise and counterclockwise) are only used for identification purposes to aid the reader&#39;s understanding of the disclosed embodiments, and do not create limitations, particularly as to the position, orientation, or use of the disclosed embodiments. Joinder references (e.g., attached, coupled, connected, and the like) are to be construed broadly and may include intermediate members between a connection of elements and relative movement between elements. As such, joinder references do not necessarily infer that two elements are directly connected and in fixed relation to each other. It is intended that all matter contained in the above description or shown in the accompanying drawings shall be interpreted as illustrative only and not as limiting. Changes in detail or structure may be made without departing from the present teachings as defined in the appended claims. 
     Various embodiments are described herein to various apparatuses, systems, and/or methods. Numerous specific details are set forth to provide a thorough understanding of the overall structure, function, manufacture, and use of the embodiments as described in the specification and illustrated in the accompanying drawings. It will be understood by those skilled in the art, however, that the embodiments may be practiced without such specific details. In other instances, well-known operations, components, and elements have not been described in detail so as not to obscure the embodiments described in the specification. Those of ordinary skill in the art will understand that the embodiments described and illustrated herein are non-limiting examples, and thus it can be appreciated that the specific structural and functional details disclosed herein may be representative and do not necessarily limit the scope of the embodiments, the scope of which is defined solely by the appended claims. 
     Reference throughout the specification to “various embodiments,” “some embodiments,” “one embodiment,” or “an embodiment”, or the like, means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment. Thus, appearances of the phrases “in various embodiments,” “in some embodiments,” “in one embodiment,” or “in an embodiment”, or the like, in places throughout the specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. Thus, the particular features, structures, or characteristics illustrated or described in connection with one embodiment may be combined, in whole or in part, with the features, structures, or characteristics of one or more other embodiments without limitation given that such combination is not illogical or non-functional. 
     It must be noted that, as used in this specification and the appended claims, the singular forms “a,” “an” and “the” include plural referents unless the content clearly dictates otherwise. 
     The terms “first,” “second,” and the like in the description and in the claims, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the terms so used are interchangeable under appropriate circumstances such that the embodiments of the disclosure described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms “include,” “have,” and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements is not necessarily limited to those elements, but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. 
     The terms “left,” “right,” “front,” “rear,” “top,” “bottom,” “over,” “under,” and the like in the description and in the claims, if any, are used for descriptive purposes and not necessarily for describing permanent relative positions. It is to be understood that the terms so used are interchangeable under appropriate circumstances such that the embodiments of the disclosure described herein are, for example, capable of operation in other orientations than those illustrated or otherwise described herein. 
     All numbers expressing measurements and so forth used in the specification and claims are to be understood as being modified in all instances by the term “about.” 
     Any patent, publication, or other disclosure material, in whole or in part, that is said to be incorporated by reference herein is incorporated herein only to the extent that the incorporated materials does not conflict with existing definitions, statements, or other disclosure material set forth in this disclosure. As such, and to the extent necessary, the disclosure as explicitly set forth herein supersedes any conflicting material incorporated herein by reference. Any material, or portion thereof, that is said to be incorporated by reference herein, but which conflicts with existing definitions, statements, or other disclosure material set forth herein will only be incorporated to the extent that no conflict arises between that incorporated material and the existing disclosure material.