Patent Publication Number: US-2023158390-A1

Title: Hybrid fitness ladder

Description:
CLAIM OF PRIORITY 
     This patent document claims priority to U.S. Provisional Application No. 63/264,323, filed on Nov. 19, 2021, the disclosure of which is incorporated herein by reference in its entirety. 
    
    
     BACKGROUND 
     Agility ladders and raised ladders are typically used to help athletes perform training exercises. For example, an agility ladder may be used to allow a user to develop speed and agility by performing footwork drills, where the user steps in and out of the space between the rungs of the ladder in quick succession. As another example, raised ladders can allow a user to develop lower body power by performing hurdle drills, where the user jumps over the heightened rungs of the ladder. 
     These training exercises or drills can be used to train various athletic skills such as, for example, control, speed, agility, coordination and/or the like. However, raised ladders and agility ladders are typically two distinct devices. Some “two-in-one” devices combine elements of raised ladders with those of agility ladders by allowing a user to raise and lower the rungs of the ladder to switch between a raised and agility configuration. However, these devices typically cannot be disassembled so that elements of the ladder can be used in different drills or exercises. In addition, these devices are typically configured to maintain a linear shape, which limits the variety of drills that can be performed using the device. 
     This document describes assemblies that are directed to addressing the problems described above, and/or other issues. 
     SUMMARY 
     In one aspect, the present disclosure relates to a hybrid fitness ladder that includes a plurality of rung units. Each rung unit includes a plurality of elevated rails and a plurality of ground rails. Each ground rail is integrated with or connected to at least one of the elevated rails. The ladder also includes at least one rung unit connector having a first end and a second end. The first end of each rung unit connector is configured to separably connect to a respective first one of the rung units, and the second end of each rung unit connector is configured to separably connect to a respective next one of the rung units. 
     Optionally, any of the elevated rails may include a first support member, a second support member, and an elongated portion that extends between the first support member and the second support member. The elongated portion is supported in an elevated position by the first support member and the second support member. 
     Optionally, any of the ground rails may include a first end, a second end, and an elongated portion that extends between the first end and the second end of the ground rail. At least a portion of the elongated portion of the ground rail is configured to contact a surface on which the hybrid fitness ladder is positioned. 
     In any of the embodiments above, the elevated rails of each rung unit comprise a first elevated rail and a second elevated rail, the ground rails of each rung unit comprise a first ground rail and a second ground rail, the first and second elevated rails of each rung unit are substantially parallel to each other and define a first and second side of the rung unit, and the first and second ground rails of each rung unit are substantially parallel to each other and define a third and a fourth side of the rung unit. 
     In any of the embodiments above, for each rung unit: (i) the elevated rails of the rung unit comprise a first elevated rail and a second elevated rail; (ii) the ground rails of the rung unit comprise a first ground rail and a second ground rail; (iii) the first support member of the first elevated rail is connected to a first end of the first ground rail to form a first corner of the rung unit; (iv) the second support member of the first elevated rail is connected to a first end of the second ground rail to form a second corner of the rung unit; (v) the first support member of the second elevated rail is connected to a second end of the first ground rail to form a third corner of the rung unit; and (vi) the second support member of the second elevated rail is connected to a second end of the second ground rail to form a fourth corner of the rung unit. 
     In any of the embodiments above, each rung unit may include a plurality of fastener elements configured to attach to a rung unit connector. Optionally, each of the rung unit connectors may be configured to removably and rotatably connect to at least one of the plurality of rung units. Optionally, a first of the rung units may be connected to a second of the rung units by two of the rung unit connectors, the two rung unit connectors may connect to the first rung unit at different corners of a same side of the first rung unit, and the two rung unit connectors connect to the second rung unit at different corners of a same side of the second rung unit. 
     In any of the embodiments above, a plurality of the rung units may be connected in series, with two rung unit connectors positioned between each pair of rung units of the plurality of rung units. 
     In any of the embodiments above, each of the elevated rails has an I-beam shaped cross-section. 
     In any of the embodiments above, each of the plurality of ground rails has an I-beam shaped cross-section. 
     In any of the embodiments above, the elevated rails and ground rails are removably attached to one another such that the ground rails and elevated rails are reconfigurable with respect to one another. 
     In another aspect, this disclosure describes a rung unit for a hybrid fitness ladder, the rung unit comprising a plurality of ground rails and a plurality of elevated rails. Each elevated rail includes an elongated portion that is elevated with respect to each of the ground rails. Each of the ground rails is integrated with or connected to a first of the elevated rails at a first and to a second of the elevated rails at a second end. The elevated rails are made of a semi-flexible material that is deformable and biased toward a configuration in which the elevated rails are supported in an elevated position. 
     Optionally, each elevated rail of the above-described rung unit comprises a first support member, a second support member, and the elongated portion. The elongated portion may extend between the first end portion and the second end portion. 
     Optionally, the plurality elevated rails of the rung unit comprise a first elevated rail and a second elevated rail, the ground rails comprise a first ground rail and a second ground rail, the first and second elevated rails are substantially parallel to each other and define a first and second side of the rung unit, and the first and second ground rails are substantially parallel to each other and define a third and a fourth side of the rung unit. 
     Optionally, in the rung unit: (i) each of the elevated rails may comprise a first support member and a second support member that support the elongated portion in an elevated position; (ii) the first support member of a first of the elevated rails is connected to a first end of a first of the ground rails to form a first corner of the rung unit; (iii) the second support member of the first elevated rail is connected to the first end of a second of the ground rails to form a second corner of the rung unit; (iv) the first support member of a second of the elevated rails is connected to a second end of the first ground rail to form a third corner of the rung unit; and (v) the second support member of the second elevated rail is connected to a second end of the second ground rail to form a fourth corner. 
     Optionally, the rung unit also may comprise a plurality of fastener elements, each of which is configured to attach to a rung unit connector. 
     Other embodiments are directed to a hybrid fitness ladder comprising a plurality of any of the rung unit embodiments described above, wherein each rung unit is connected to another rung unit by at least one rung unit connector. In such a hybrid fitness ladder, each rung unit connector may be configured to removably and rotatably connect to at least one of the rung units such that either the ground rails or the elevated rails of each of the rung unit may be positioned to be rungs of the ladder. A first rung unit may be connected to a second rung unit by two rung unit connectors, the two rung unit connectors may connect the first rung unit at different corners of a same side of the first rung unit, and the two rung unit connectors may connect the second rung unit at different corners of a same side of the second rung unit. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The accompanying drawings, which are incorporated herein and constitute part of this specification, are illustrative of particular embodiments of the present disclosure and do not limit the scope of the present disclosure. 
         FIG.  1    is a perspective view of an example hybrid ladder in a first configuration in which segments of the side rails are elevated with respect to the rungs. 
         FIG.  2 A  is a perspective view of an example rung unit. 
         FIG.  2 B  is a top view of an example rung unit. 
         FIG.  3    is a perspective view of an example non-linear hybrid ladder in a second configuration in which the rungs are elevated with respect to the side rails. 
         FIG.  4    is a perspective view of another example of a non-linear hybrid ladder in a third configuration. 
         FIG.  5    is a perspective view of an example showing several rung units of a hybrid ladder separated from each other, thus in a fourth configuration. 
         FIG.  6 A  is a side view of an example rung unit. 
         FIG.  6 B  is a front view of an example rung unit. 
         FIG.  7 A  is a perspective view of an example rung unit connector. 
         FIG.  7 B  is a side view of an example rung unit connector. 
         FIG.  8    is a front view of an example rung unit and an example rung unit connector. 
         FIG.  9 A  is a top view of an example rung unit and an example rung unit connector with the rung unit connector in a ground-aligned position. 
         FIG.  9 B  is a top view of an example rung unit and an example rung unit connector with the rung unit connector in an unaligned position. 
         FIG.  10 A  is a top view of two example rung units connected by two example rung unit connectors. 
         FIG.  10 B  is a front view of two example rung units connected by two example rung unit connectors. 
         FIG.  11    is a perspective view of three example rung units in a stacked configuration. 
     
    
    
     DETAILED DESCRIPTION 
     The following discussion omits or only briefly describes conventional features of the disclosed technology that are apparent to those skilled in the art. Reference to various embodiments does not limit the scope of the claims attached hereto. Additionally, any examples set forth in this specification are intended to be non-limiting and merely set forth some of the many possible embodiments for the appended claims. Further, particular features described herein can be used in combination with other described features in each of the various possible combinations and permutations. A person of ordinary skill in the art would know how to use the instant invention, in combination with routine experiments, to achieve other outcomes not specifically disclosed in the examples or the embodiments. 
     It is also to be understood that the terminology used in the description is for the purpose of describing the particular versions or embodiments only and is not intended to limit the scope of the present disclosure which will be limited only by the appended claims. Unless otherwise specifically defined herein, all terms are to be given their broadest possible interpretation including meanings implied from the specification as well as meanings understood by those skilled in the art and/or as defined in dictionaries, treatises, etc. Unless defined otherwise, all technical and scientific terms used herein have the same meanings as commonly understood by one of ordinary skill in the art. Although any methods, equipment, and materials similar or equivalent to those described herein can be used in the practice or testing of embodiments of the present disclosure, the preferred methods, devices, and materials are now described. All references mentioned herein are incorporated by reference in their entirety. 
     The present disclosure generally relates to a hybrid ladder that includes features of an agility ladder (e.g., ground rails) and features of a raised ladder (e.g., elevated rails). The hybrid ladder of the present disclosure allows for the use of either the ground rails or the elevated rails to be used as ladder rungs for training purposes. Additionally, it is possible to train using a combination of ground rails and elevated rails as ladder rungs for training purposes. 
     Referring to  FIGS.  1 ,  2 A and  2 B , the present disclosure describes hybrid ladder  100  that is reconfigurable and comprises at least one rung unit  125 , each of which has a plurality of elevated rails  120  and a plurality of ground rails  140 . (The figures show each rung unit having respective ground rails  140   a  and  140   b , but this disclosure may generally refer to all such elements as ground rails  140 .) Each ground rail  140  is integrated with or connected to at least one elevated rail  120 . (The figures show each rung unit having respective elevated rails  125   a  and  125   b , but this disclosure may generally refer to all such elements as ground rails  140 .) The rung units  125  are rotatable such that either the ground rail  140  or the elevated rail  120  are able to function as ladder rungs. As shown in  FIG.  1   , the ground rail  140   b  of a first rung unit  125   x  may be connected to the ground rail  140   a  of a second rung unit  125   y  via one or more rung unit connectors  175   x . A rung unit connector (which this document may generally refer to using reference number  175 ) is an elongated arm with structures at each end that interconnect one rung unit with a next rung unit, as will be described in more detail below. In some embodiments, more than two rung units  125   x ,  125   y ,  125   z  can be separably connected to one another using multiple rung unit connectors  175   x ,  175   y.    
       FIG.  1    illustrates an example hybrid fitness ladder  100  in a first configuration according to an embodiment, discussed in further detail below. In this configuration, as will be discussed in more detail below, the side rails of the ladder have segments that are elevated with respect to all of the ground rails  140  of the ladder. In this configuration, the hybrid fitness ladder  100  the ground rails  140  of the ladder serve as rungs between partially elevated side rails  125 , allowing a user to utilize the hybrid fitness ladder  100  by running, jumping, or otherwise navigating the rungs of the latter without any change in elevation between the side rails. 
       FIG.  3    shows another configuration in which the rung units  125  of the hybrid fitness ladder  300  are oriented so that all of the elevated rails  120  are positioned to serve as rungs of the latter, and all of the ground rails  140  of the rung units serve as side rails of the ladder, allowing a user to utilize the hybrid fitness ladder  100  by running between, jumping over, or otherwise navigating the rungs formed of elevated rails  120 . 
       FIG.  4    shows a third configuration in which ladder  400  incorporates elements of both the first and second configurations. In this configuration, the multiple rung units  125  are interconnected so that for some (but not all) of the rung units (in this case rung units  125   x  and  125   z , the elevated rails  120  are positioned as rungs of the ladder and the ground rails  140  are positioned as side rails of the ladder, while the remainder of the rung units (in this example rung unit  125   y  is positioned so that the elevated rails  120  are positioned as side rails of the ladder and the ground rails  140  are positioned as rungs of the ladder. 
       FIG.  5    shows a fourth configuration in which rung units  125  of ladder  500  are completely separated from each other. 
     Returning to  FIGS.  2 A and  2 B , features of an example rung unit  125  according to an embodiment will now be described. The rung unit  125  includes at least one elevated rail  120  and at least one ground rail  140 . For example, as illustrated in the top view of  FIG.  2 B , the rung unit  125  includes two substantially parallel elevated rails  120   a ,  120   b  that are spaced apart from one another, and two substantially parallel ground rails  140   a ,  140   b  that are spaced apart from one another. Thus, each ground rail  140  of the rung unit is perpendicularly positioned with respect to each elevated rail  120 . However, embodiments in which the ground rails  140  and elevated rails  120  are positioned at other angles so that they that are not perpendicular to each other are included within the scope of this disclosure. For example, the rung unit  125  may have a rhomboid or parallelogrammatic shape when viewed from above. 
     The two ground rails  140   a ,  140   b  and the two elevated rails  120   a ,  120   b  are operably connected to form the rung unit  125 . In some embodiments, as shown in  FIGS.  2 A and  2 B , each end of a ground rail  140  may be connected to a corresponding end of an elevated rail  120  of the rung unit at a rung corner  260   a - 260   d  (which this disclosure may generally refer to as rung corners  260 ), thus forming a square or rectangular shape when viewed from above as shown in  FIG.  2 B . Alternatively, the rung unit  125  may be a single unit of integrated elevated rails  120  and ground rails  140 . 
     Thus, in the examples shown, the rung unit  125  may have first and second elevated rails  120 . The first and second elevated rails  120  may be substantially parallel to each other and define a first and second side of the rung unit  125 . The rung unit  125  may have first and second ground rails  140  that are substantially parallel to each other and define a third and a fourth side of the rung unit  125 . A first end of the first elevated rail  120   a  may be connected to a first end of the first ground rail  140   a  at a first corner  260   a . A second support member of the first elevated rail  120   a  may be connected to a first end of the second ground rail  140   b  at a second corner  260   b . A first support member of the second elevated rail  120   b  may be connected to a second end of the first ground rail  140   a  at a third corner  260   b . A second support member of the second elevated rail  120   b  may be connected to a second end of the second ground rail  140   b  at a fourth corner  260   d.    
     In some examples, each ground rail  140  and elevated rail  120  have approximately the same length and/or other dimensions, other than height. In some other embodiments, the ground rails  140  and elevated rails  120  may have different lengths and/or other dimensions. 
       FIG.  6 A  illustrates an example elevated rail  120  of a rung unit  125  according to an embodiment.  FIG.  6 B  is a side view of the rung unit  125  of  FIG.  6 A . As illustrated in  FIGS.  6 A and  6 B , the rung unit  125  has at least one elevated rail  120 . At least a portion of each elevated rail  120  may be positioned at a higher elevation relative to a ground rail  140 . For example, each elevated rail  120  may include an elongated portion  620  having a first support member  625   a  and a second support member  625   b . The elongated portion  620  may extend between the first support member  625   a  and the second support member  625   a . The elongated portion  620  may be supported in an elevated position by the first support member  625   a  and the second support member  625   b . The first support member  625   a  may be integrally connected to a first end of the elongated portion  620 . The second support member  625   b  may be integrally connected to a second end of the elongated portion  620 . Each support member  625   a ,  625   b  may be configured at angle relative to a surface on which the rung unit  125  is positioned. Support members  625   a ,  625   b  each may be connected at a second end to an end of a ground rail  140 . For example, in  FIG.  6 A , the ends of the support members  625   a ,  625   b  may be generally rounded to create a gradual transition from the elevated, elongated portion  620  of the elevated rail  120  to the ground rung  140 . Alternatively, the connections between the elongated portion  620  and the support members  625   a ,  625   b , as well as the connections between the support members  625   a ,  625   b  and the rung corner  260  may be more rigid, creating sharp angles. As another alternative, the elevated rail  120  may be semi-circular in shape between two rung corners  260 . 
     The height of the elongated portion  620  with respect to a rung corner  260 , ground rung  140 , or surface on which the rung unit  125  is positioned may be any height appropriate for various training exercises. For example, the elongated portion  620  may have a height of at least 0.5 inch, at least 1 inch, less than 10 inches, less than 8 inches, about 1 inch to 8 inches, 1 inch to 2 inches, 2 inches to 3 inches, 3 inches to 4 inches, or 4 inches to 5 inches, 5 inches to 6 inches, 6 inches to 7 inches, or 7 inches to 8 inches with respect to any of the above-described elements. 
     The angle of one or more of the support members  625   a ,  625   b  with respect to a ground rung  140 , elongated portion  620 , or ground surface may be any angle to achieve the desired height of the elongated portion  620 . For example, support members  625   a ,  625   b  may each be angled at about 30 to about 90 degrees, about 30 to about 40 degrees, about 40 to about 50 degrees, about 50 to about 60 degrees, about 60 to about 70 degrees, about 70 to about 80 degrees, or about 80 to about 90 degrees with respect to any of the above-described elements. Additional and/or alternate angles may be used within the scope of this disclosure. 
     Each elevated rail  120  may be of any shape, size, dimensions, composition, texture, and/or other characteristics that are appropriate for the proper function of the elevated rails. For example, each elevated rail  120  may have a thickness of at least 0.1 inch, less than 0.5 inch, about 0.1 to 0.5 inch, about 0.1 to 0.2 inch, about 0.2 to about 0.3 inch, about 0.3 to about 0.4 inch, or about 0.4 to about 0.5 inch. In some embodiments, each elevated rail  120  has an I-beam construction and is thicker at the edges of the rail than in the center, as illustrated in, for example  FIGS.  6 B and  8   . In some embodiments, the edges of the elevated rail  120  may have a thickness of at least 0.1 inch, less than 0.5 inch, about 0.1 to about 0.5 inch, about 0.1 to about 0.2 inch, about 0.2 to about 0.3 inch, about 0.3 to about 0.4 inch, or about 0.4 to about 0.5 inch. For example, the center of each elevated rail may have a thickness of approximately 0.1 inch at the center and a thickness of approximately 0.3 inch at the edges. An elevated rail  120  may have a width of at least 0.5 inch, less than 3 inches, about 0.5 to about 3 inches, about 0.5 to about 1 inch, about 1 to about 1.5 inch, about 1.5 to about 2 inches, about 2 to about 2.5 inches, or about 2.5 to about 3 inches. It is understood that elevated rails  120  having alternate thicknesses and/or widths are within the scope of this disclosure. 
     In this document, the “length” of an elevated rail  120  is its dimension as measured from one end to another (i.e., from one rung corner  260  of a rung unit  125  to another rung corner of the rung unit), while “width” of an elevated rail  120  is the dimension that is parallel to length when viewed from above. Each elevated rail  120  may have a length appropriate for the purpose of the hybrid fitness ladder  100 . For example, each elevated rail  120  may have a length (as measured from one end of the elevated rail to the other) that is approximately the “hip width” or “shoulder width” of an average person. Elevated rails may be at least 15 inches, less than 25 inches, about 15 to about 19 inches, about 15 to about 16 inches, about 16 to about 17 inches, about 17 to about 18 inches, or about 18 to about 19 inches. It is understood that elevated rails  120  having alternate lengths are within the scope of this disclosure. 
     Each ground rail  140  may have an elongated portion that extends between a first end and a second end of the first ground rail  140 . In some embodiments, at least a portion of the elongated portion of each ground rail  140  is configured to contact a surface on which the hybrid fitness ladder is positioned. In some examples, each ground rail  140  has substantially the same dimensions and features as each elevated rail  120 . For example, each ground rail  140  may have substantially the same thickness and width as each elevated rail  120 . In other embodiments, each ground rail  140  may have different dimensions than the elevated rails  120 . 
     Each ground rail  140  may be of any shape, size, dimensions, composition, texture, and/or other characteristics that are appropriate for the proper function of each ground rail. For example, a ground rail  140  may have a uniform thickness of at least 0.1 inch, less than 1 inch, about 0.1 to about 0.5 inch, about 0.1 to about 0.2 inch, about 0.2 to about 0.3 inch, about 0.3 to about 0.4 inch, or about 0.4 to about 0.5 inch. In other embodiments, a ground rail  140  may be thicker at its edges than in its center, as illustrated in, for example  FIG.  8   . In some examples, the ground rail  140  may have an I-beam shaped cross-section. The edges of the ground rail  140  may have a thickness of at least 0.1 inch, less than 1 inch, about 0.1 to about 0.5 inch, about 0.1 to about 0.2 inch, about 0.2 to about 0.3 inch, about 0.3 to about 0.4 inch, or about 0.4 to about 0.5 inch. For example, the center of the ground rail may have a thickness of about 0.1 inch at the center and a thickness of about 0.3 inch at the edges. Each ground rail  140  may have a width of greater than 0.5 inch, less than about 3 inches, about 0.5 to about 3 inches, about 0.5 to about 1 inch, about 1 to about 1.5 inch, about 1.5 to about 2 inches, about 2 to about 2.5 inches, or about 2.5 to about 3 inches. It is understood that ground rails  140  having alternate thicknesses and/or widths are within the scope of this disclosure. 
     Ground rails  140  may additionally have any length appropriate for the purposes of the hybrid fitness ladder  100 . For example, ground rails  140  may have a length (as measured from one end of the elevated rail to the other) that is approximately the “hip width” or “shoulder width” of an average person. Ground rails  140  may be at least 15 inches, less than 20 inches, about 15 to 19 inches, about 15 to about 16 inches, about 16 to about 17 inches, about 17 to about 18 inches, or about 18 to about 19 inches. It is understood that ground rails  140  having alternate lengths are within the scope of this disclosure. Optionally, ground rails  140  may have the same length as elevated rails  120 . For example, ground rails  140  and elevated rails  120  may each be about 18 inches long and about 1 inch wide. The ground rails  140  and elevated rails  120  may be connected in a square such that the outside of the square is about 18 inches by about 18 inches and the interior of the square is about 16 inches by about 16 inches. Alternatively, the ground rails  120  may each have a different length than the elevated rails  120  in the rung unit  125 . 
     An elevated rail  120  and/or ground rail  140  may have one or more additional features that provide for enhanced grip or traction. For example, grip tape, adhesives, or textured markings may be applied to at least a portion of an elevated rail  120  and/or a ground rail  140 . The elevated rails  120  and ground rails  140  illustrated in  FIGS.  1 - 11    are shown as having substantially linear elements. However, it is contemplated that an elevated rails  120  and/or ground rails  140  may have non-linear curves or angles within the scope of this disclosure. 
     In some embodiments, such as that shown in  FIGS.  6 A and  6 B , a ground rail  140  may attach at a first end to a first elevated rail  120   a  and at a second end to a second elevated rail  120   b . The ground rail  140  may attach to each elevated rail  120   a ,  120   b  at a corresponding rung corner  260   a ,  260   b . In various embodiments, each ground rail  140  and elevated rail  120  may be immovably connected at a rung corner  260 . Alternatively, a ground rail  140  and an elevated rail  120  may be pivotally connected to one another at a rung corner  260 . In other embodiments, an elevated rail  120  and a ground rail  140  may be integrally joined at a rung corner  260 . In other embodiments, an elevated rails  120  and a ground rail  140  may connect at a rung corner  260  via a lap joint where the ends of each run overlap and are fastened together. 
     In some embodiments, the elevated rails and ground rails  140  are permanently connected at the rung corners  260 . In other embodiments, the elevated rails  120  and ground rails  140  of a rung unit  125  are separable from one another. For example, the elevated rail  120  and the ground rail  140  of a rung unit  125  may be secured in such a way that a user may separate them with or without using ordinary tools. For example, as shown in  FIG.  6 B , the ends of an elevated rail  120  and the ends of a ground rail  140  are configured to overlap at a rung corner  260  and be secured with a rung joint  660 . The rung joint  660  may be any suitable mechanism for attaching two objects. Examples of rung joints  660  may include, without limitation, a snap, a stud, a screw, a nut and bolt, a button, a magnet, hook and loop fastener, split pin fastener, and/or the like. The rung joint  660  may be configured to permanently join the elevated rail  120  with the ground rail  140 , or the rung joint  660  may allow for the elevated rail  120  to be selectively coupled and decoupled to the ground rail  140 . 
     As shown in  FIGS.  6 B and  8   , each rung corner  260  also may have a first connector joint element  665  configured to allow the rung corner to engage with a second rung unit connector element of a rung unit connector  175 . Optionally, the first connector joint element  665  may additionally function to secure the elevated rail  120  with the ground rail  140 . In other contemplated embodiments, the rung joint  660  and the first connector joint element  665  may be a single unit. It is contemplated that one of ordinary skill may use alternative ways to join the elevated rail  120  and the ground rail  140 . 
     As shown in  FIGS.  7 A and  7 B , the rung unit connector  175  may be made of a flexible fabric, such as nylon. The rung unit connector  175  may also be rigid and made of a polymer, metal, wood or another material. In embodiments where the rung unit connector  175  is rigid, the rung unit connector  175  may be substantially straight or non-linear. In some embodiments, the rung unit connector  175  may be less than 0.1 inch. Alternatively, the rung unit connector  175  may be greater than 0.1 inch, less than 1 inch, about 0.1 inch to 1 inch, about 0.1 to about 0.3 inch, about 0.3 to about 0.5 inch, about 0.5 to about 0.7 inch, about 0.7 to about 1 inch in thickness. Rung unit connectors  175  may have a width of greater than 0.5 inch, less than 2 inches, about 0.5 to about 2 inches, about 0.5 to about 1 inch, about 1 to about 1.5 inch, or about 1.5 to about 2 inches. Rung unit connectors  175  may be greater than 15 inches, less than 19 inches, about 15 to about 19 inches, about 15 to about 16 inches, about 16 to about 17 inches, about 17 to 18 inches, about 18 to about 19 inches. 
     On either end of the rung unit connector  175 , there may be a way of separably connecting the rung unit connector  175  to a rung corner  260 . For example, the rung unit connector  175  may have a second connector joint element  765 , as best shown in  FIG.  7 B , in which the first connector joint element  665  includes a post and the second connector joint element  765  includes a receptacle that receives the post. The relative positions of posts and receptacles may be reversed in other embodiments. 
     The rung unit connector  175  may further have a connector cap  725  (see  FIGS.  7 A and  7 B ) which may serve various functions including securing the second connector joint element  765  to the first connector joint element  665  and/or rung corner  260 ; protecting the connector joint elements  665 ,  765  and/or rung corner  260  from damage; protecting the user from contacting the connector joint elements  665 ,  775  and/or rung corner  260 ; or allowing for removability of the rung unit connector  175  from the rung corner  260 . The rung unit connector  175  may also have a separator  775  positioned between the rung unit connector  175  and the rung corner  260 . The separator  775  may be a washer or a bearing and may provide spacing between the rung unit connector  175  and the rung corner  260  and to promoting rotatability of the rung unit connector  175  with respect to a rung unit  125 . 
     The rung unit connector  175  may engage with the rung corner  260  of a rung unit  125  in any suitable way. In certain embodiments, the rung unit connector  175  is selectively removable from the rung unit  125  to allow for disassembly and storage. 
     Additionally, the rung unit connector  175  is selectively removable from the rung units  125  to allow for alternative configurations such as the configurations shown in  FIGS.  1  and  3 - 5   . Other configurations including more or less than the three rung units  125  and four rung unit connectors  175  are additionally possible. For example, more or less rung units  125  and rung unit connectors  125  can be used for different configurations depending on a desired use. In some examples, a hybrid configuration can exist where one or more rung units  125  that are separated can be used with one or more rung units  125  that are connected by one or more rung unit connectors  175 . Additionally, rung units  125  can be rotated such that the ground rails  140  and the elevated rails  120  are switched with respect to the configurations of  FIGS.  1 , and  3 - 5   . Additionally, a combination of rung units  125  with elevated rails  120  being parallel and perpendicular to one another is possible such that some rung units  125  are rotated and some are in a similar configuration with respect to the configurations of  FIGS.  1 , and  3 - 5    and other configurations described herein. 
     As shown in  FIG.  8   , the end of the rung unit connector  175  may be configured to align vertically with an end of an elevated rail  120  and an end of a ground rail  140 . In some embodiments, an end of a rung unit connector  175 , an end of an elevated rail  120  and an end of a ground rail  140  may each have an aperture, which may be aligned such that a first connector joint element  665  may pass through a corresponding second connector joint element  775  of a rung unit connector  175 , an elevated rail  120 , and a ground rail  140 , thereby holding the members together at the rung corner  260 . Optionally, first connector joint elements  665  may each include a post to which an upper rivet  875  and a lower rivet  825  are attached, positioned above and below both an end of an elevated rail  120  and an end of a ground rail  140 . The upper rivet  875  and lower rivet  825  may be configured to stabilize the connection of an elevated rail  120  and a ground rail  140 . A separator  775  and a connector cap  725  may be positioned above and below the rung unit connector  175  and engaged with a first connector joint elements  665 . Separators  775  and connector caps  725  may be configured to allow the user to easily disengage rung unit connectors  175  from rung units  125 . The connection in  FIG.  8    is one example of a contemplated way of joining a rung unit connector  175 , with a ground rail  140 , and an elevated rail  120 . Additionally, alternative connections that allow for easy disengagement and separation of rung unit connectors  175  from rung units  125  known or discernable to one of ordinary skill are contemplated. 
     As shown in  FIGS.  9 A and  9 B , a rung unit connector  175  may be configured to rotate or be removed to switch positions with respect to a rung unit  125 . As shown in  FIG.  9 A , the rung unit connector  175  may be configured to have a ground-aligned position, where one or more rung unit connectors  175  are substantially parallel to a ground rail  140  and substantially perpendicular to an elevated rail  120 . The rung unit connector  175  may be configured to have an elevated-aligned position where one or more rung unit connectors  175  are substantially parallel to an elevated rail  120  and substantially perpendicular to a ground rail  140  (such as is illustrated in  FIG.  1   ). As shown in  FIG.  9 B , rung unit connectors  175  may also be configured to have an unaligned position, where the rung unit connector  175  is neither substantially parallel to an elevated rail  120  nor substantially parallel to a ground rail  140 . This is shown by way of example by rung unit connectors  175   x  in  FIG.  3   , and all rung unit connectors  175   x ,  175   y  of  FIG.  4   . The rung unit connector  175  may be configured to rotate freely around the connector joint  665 . 
     The rung unit connector  175  may have at least one reciprocal fastener element. The reciprocal fastener element may removably and rotatably attach to a fastener element on a rung unit  125 . A rung unit  125  may have a plurality of fastener elements. A fastener element may connect to a reciprocal fastener element using any suitable element. Examples of fastener elements and reciprocal fastener elements may include, without limitation, a snap, a button, a magnet, hook and loop fastener, split pin fastener, and/or the like. The fastener elements and reciprocal fastener elements may also be configured allow the rung unit connector  175  to rotatably “snap” into the ground-aligned or elevated-aligned position, such that a user can maintain a more linear hybrid ladder (for example in  FIG.  1   ). The fastener elements and reciprocal fastener elements may “snap” into place using any suitable mechanism. 
     The hybrid fitness ladder  100  may be made of any suitable materials or combinations of materials. Elevated rails  120  and ground rails  140  may be made of a rigid material. Alternatively, elevated rails  120 , ground rails  140 , or both may be made of a semi-flexible material that allows the hybrid fitness ladder  100  to bend without breaking. Elevated rails  120  and ground rails  140  may be made of a semi-flexible material that is biased toward a first configuration such that when elevated rails  120  and ground rails  140  are deformed, they will return to the first configuration. For example, in such embodiments, when a user steps on an elevated rail  120 , the elevated rail  120  will be deformed and will return to its original configuration when the user steps off the elevated rail  120 . For example, elevated rail  120  and ground rail  140  may be made of an injection molded plastic. Elevated rails  120  and ground rails  140  may be made of a polyethylene plastic. An elevated rail  120  and/or a ground rail  140  may have other structures, textures, and/or shapes that provide strength, stability, and/or flexibility. In some embodiments, the fasteners of the hybrid fitness ladder  100  may be made of a metal. In some embodiments, rung unit connectors  175  may be made of a flexible material such as nylon. 
     In some configurations, a first rung unit  125  may be connected to a second rung unit  125  by one or more rung unit connectors  175 . In other configurations, a first rung unit  125  is connected to a second rung unit  125  by two rung unit connectors  175 . One example configuration is shown in  FIG.  1   , a first rung unit  125   x  may be connected to a second rung unit  125   y  by two rung unit connectors  175   x ; and the second rung unit  125   y  may be further connected to a third rung unit  125   x  by two rung unit connectors  175   y . More or fewer rung units  125  may be attached or removed from the hybrid ladder  100  in this fashion. 
     In the configuration depicted in  FIG.  1   , each rung unit connector  175  may have a first end  173  and a second end  177 . As shown in various other figures, when attached to a rung unit  125 , a rung unit connector  175  may be configured to pivotally engage with a rung corner  260 . Multiple rung unit connectors  175  may attach to a single rung unit  125 , and a single rung unit connector  175  may attach to multiple rung units  125 . For example, a first end  173  of a rung unit connector  175  may attach to a rung corner  260  of one rung unit  125 , while the second end  177  of the rung unit connector  175  may attach to a rung corner  260  of a different rung unit  125 . As illustrated in  FIG.  1   , a rung unit connector  125  may have a linear shape. However, it is understood that other shapes of rung unit connectors  125  may be used within the scope of this disclosure. In particular, the rung unit connectors  125  may be made of a flexible material that may be linear or non-linear depending on the intended configuration of the hybrid ladder  100 . 
     In the configuration depicted in  FIG.  1   , two rung unit connectors (each designated as  175   x ) may form a rung unit connector pair in which each rung unit connector  175   x  attaches to two rung units  125   x  and  125   y . A first end  173  of a first rung unit connector  175   a  may connect to one rung unit  125   a , while the second end  177  of the first rung unit connector  175   a  may connect to the other rung unit  125   b . Similarly, a first end  173  of a second rung unit connector  175   b  may connect to rung unit  125   a , while the second end  177  of the second rung unit connector  175   b  may connect to the other rung unit  125   b.    
     As described previously, the rung unit connector  175  may be used to connect a plurality of rung units  125  together to form a hybrid ladder, such as the hybrid ladder  100  of  FIG.  1   . Another example, as shown of a configuration of the hybrid ladder  1000  is depicted in  FIGS.  10 A and  10 B , a first rung unit  125   x  can be connected to a second rung unit  125   x  by a rung unit connector pair comprising a first rung unit connector  175   a  and a second rung unit connector  175   b . For example, a first rung unit connector  175   a  may have a first rung unit connector end  1075   a  which connects to a first rung unit  125   x  at the corner of sides  1025   a  and  1025   c , and a second rung unit connector end  1075   b , which connects to a second rung unit  125   y  at a corner of sides  1025   a  and  1025   d . Additionally, a second rung unit connector  175   b  may have a first rung unit connector end  1075   a , which connects to a first rung unit  125   x  at a corner of sides  1025   b  and  1025   c , and a second rung unit connector end  1075   b , which connects to a second rung unit  125   y  at a corner of sides  1025   b  and  1025   d . Additional rung unit connectors  175  and rung units  125  may be added to the hybrid ladder  1000  of  FIGS.  10 A and  10 B  by, for example, attaching a rung unit connector pair  170  to a side  1025   a  and/or side  1025   b  of the second rung unit  125   y  to provide an L-shaped configuration or a T-shaped configuration. A plurality of rung units  125  may be aligned in this fashion to produce a hybrid ladder  100  of any length, and a variety of shapes. The hybrid ladder  1000  of  FIGS.  10 A and  10 B  illustrates example embodiments of the ladder where the elevated rails  120  are substantially parallel to a first end  135  and a second end  145  of the ladder. Alternatively, at least one of the rung units  125  may be rotated about 90 degrees, such that at least one ground rail  140  is parallel with a first end  135  and a second end  145  of the ladder. In other embodiments, two rung units  125  may be connected by a single rung unit connector  175  to allow the ladder to form different shapes, such as squares or circles. 
     The hybrid fitness ladder  100  may be formed from any number of repeating rung units  125  and rung unit connector pairs  170 . The configuration described above is an example, and alternative configurations may be used within the scope of this disclosure. 
     In certain embodiments, a hybrid ladder  100  may have two side rails, which represent the combination of rungs units and rung unit connectors that align the long edge of the hybrid ladder  100 . For example, in  FIG.  1   , the hybrid ladder  100 , has two side rails. A first side rail includes one of each rung unit connector  175   x  and  175   y  and an elevated rail  120   a  of each rung unit. A second side rail includes one of each rung unit connector  175   x  and  175   y  and the other elevated rails  120   b , of each rung unit. 
     In various embodiments, rung units  125  may be connected in series by one or more rung unit connectors  175  such that the side rails include all of the available elevated rails  120 , as illustrated in  FIG.  1   . In other embodiments, as illustrated in, for example,  FIG.  3   , all side rails of the ladder  300  may be ground rails  145 . In other “mixed” embodiments, as illustrated by  FIG.  4   , for example, side rails of the ladder  400  may be made of both elevated rails  120  and ground rails  140 . 
     In another configuration, as illustrated by, for example,  FIG.  5   , a separated hybrid ladder  500  is shown. The separated hybrid ladder  500  includes one or more rung units  125  that are not connected to one or more other rung units  125  by rung unit connectors  175 , such that one or more rung units  125  may be positioned in any unconnected orientation with respect to one or more other rung units  125 .  FIGS.  1 - 5    illustrate examples of ways that a user can arrange the hybrid ladder, but any other hybrid ladder arrangement is within the scope of this disclosure. 
     In various configurations, such as the hybrid ladder  100  illustrated in  FIG.  1   , rung units  125  may be connected by rung unit connectors  175  such that the rung units  125  and the rung unit connectors  175  are arranged in a substantially linear configuration. In other embodiments, one or more rung unit connectors  175  may pivot with respect to one or more rung units  125 , such that they are arranged in a substantially nonlinear configuration. One or more rung unit connectors  175  may be pivoted with respect to one or more rung units  125  at one or more locations along the hybrid fitness ladder, for example a non-linear configuration of a hybrid ladder  400  is depicted in  FIG.  4   . 
     The above examples do not limit the possible configurations of the hybrid ladder described in this disclosure. For example, it is understood that a hybrid fitness ladder may be of any length and may have any number of pivots along the length of the ladder within the scope of this disclosure. 
     As shown in  FIG.  11   , the hybrid ladder  100  of the present disclosure may be configured to partially disassemble and stack for ease of storage. Rung units  125  may be configured to have substantially the same dimensions, to allow one rung unit  125  to stack on a second rung unit  125 . Each of the rung unit connectors  175  may be disconnected from a rung unit  125  at one end of the rung unit connector  175 , such that the rung unit connector  175  may rotate such that the rung unit connector  175  is parallel with a ground rail  140  of the rung unit  125 . This configuration allows for rung units  125  and rung unit connectors  175  to stack together for storage. The hybrid ladder of the present disclosure may be stored in combination with other storage devices known in the art. For example, rung units  125  and rung unit connectors  175  may be secured together using clamps, brackets, clips, straps, bags, or boxes. 
     The hybrid ladders exemplified in the present disclosure may have additional features that may not be exemplified in the figures. For example, the hybrid ladder may have a variety of decorative features, such as logos, markings, colors, patterns, transparencies, or textures. The hybrid ladder may further include features that improve the stability and ergonomics of the device, such as grips, pads, adjustable “feet,” or hand grips. The hybrid ladder of the present disclosure may be used in combination with other devices to improve the audiovisual appearance of the device, such as lights, reflective tape, sounds, timers, or beepers. The hybrid ladder of the present disclosure may additionally be used in combination with other agility and strength training devices, such as cones, balls, training apps, motion sensing devices, or other agility ladders. A plurality of hybrid ladders of the present disclosure may be used simultaneously. 
     The hybrid ladder of the present disclosure may be used for agility and strength training of at least one user. A user may run drills while the hybrid ladder is in a first configuration, and then the user may re-configure the hybrid ladder to a second configuration for a different set of drills. Multiple users may use the hybrid ladder at the same time, and a single user may use more than one hybrid ladder for a single drill. A user may use the hybrid ladder of the present disclosure with any combination of other items known to one of ordinary skill. 
     It will be appreciated that although some Figures (e.g.,  FIGS.  1 ,  4 - 5 ,  7 A- 7 B, and  11   ) depict rung units having elevated rails and ground rails that have a flat cross-section and some Figures (e.g.,  FIGS.  2 A- 2 B,  3 ,  6 A- 6 B,  8 ,  9 A- 9 B, and  10 A- 10 B ) depict rung units including elevated rails and ground rails that have I-beam cross-sections, the cross-sections can be used interchangeably between each of the embodiments disclosed herein. 
     This disclosure is not limited to the particular systems, methodologies or protocols described, as these may vary. The terminology used in this description is for the purpose of describing the particular versions or embodiments and is not intended to limit the scope. 
     In this document: (i) the term “comprising” means “including, but not limited to”; (ii) the singular forms “a,” “an,” and “the” include plural references unless the context clearly dictates otherwise; and (iii) unless defined otherwise, all technical and scientific terms used in this document have the same meanings as commonly understood by one of ordinary skill in the art. Also, terms such as “top” and “bottom”, “above” and “below”, “elevated”, and other terms describing position are intended to have their relative meanings rather than their absolute meanings with respect to ground. For example, one structure may be “above” or “elevated with respect to” a second structure if the two structures are side by side with respect to the a plane, and the first structure appears to cover or be above the second structure from the point of view of a viewer (i.e., the viewer could be closer to the first structure). 
     As used herein, the term “about” means plus or minus 10% of the numerical value of the number with which it is being used. Therefore, about 50% means in the range of 45%-55%. 
     As used herein, “integrated” refers to two parts being formed as one unit, such as a ground rail and an elevated rail may be formed as a single unit, or the whole rung unit may be formed as a single unit. 
     As used herein, the terms “exemplary” and “exemplified” are intended to mean “by way of example” and “shown by way of example,” and are not intended to specifically identify any preferred feature. 
     The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided, such as examples of agents, to provide a thorough understanding of the disclosed embodiments. One skilled in the relevant art will recognize, however, that the embodiments can be practiced without one or more of the specific details, or with other methods, components, materials, etc. In other embodiments, well-known structures, materials, or operations are not shown or described in detail to avoid obscuring aspects of the embodiments. 
     The above-disclosed features and functions, as well as alternatives, may be combined into many other different systems or applications. Various presently unforeseen or unanticipated alternatives, modifications, variations or improvements may be made by those skilled in the art, each of which is also intended to be encompassed by the disclosed embodiments.