Abstract:
A resistance exercise apparatus is provided, the apparatus comprising: a stretchable cord having opposing first and second ends, the cord having an internal cavity and an external surface; at least one plug being inserted within the internal cavity of the cord adjacent the first end of the cord; at least one sleeve being placed over the external surface of the cord adjacent the first end of the cord, the plug being situated within a length of the sleeve; at least one tether forming two compartments, a first loop compartment is designed to received at least one end of the cord with at least a portion of the sleeve and at least a portion of the plug; and at least one attachment device, at least a portion of the attachment device being designed to be received within at least a portion of the second compartment of the tether.

Description:
RELATED APPLICATIONS 
     This application is a continuation-in-part of U.S. Ser. No. 12/804,584 filed Jul. 26, 2010 now abandoned entitled “Resistance Training Exercise And Fitness Device”, which is a continuation-in-part of U.S. Ser. No. 12/546,085 filed Aug. 24, 2009 now U.S. Pat. No. 7,819,787 entitled “Resistance Training Exercise Device, System &amp; Method”, which has now been granted a Notice of Allowance and is a continuation-in-part of U.S. Ser. No. 12/344,798 filed Dec. 29, 2008 entitled “Resistance Training Exercise Device, System &amp; Method” which has now issued as U.S. Pat. No. 7,785,243. The disclosure of the above application is incorporated herein by reference. 
    
    
     STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT 
     N/A 
     COPYRIGHT NOTICE 
     A portion of the disclosure of this patent document contains material that is subject to copyright protection. The copyright owner has no objection to the facsimile reproduction by anyone of the patent document or patent disclosure as it appears in the Patent and Trademark Office patent file or records, but otherwise reserves all copyrights rights whatsoever. 
     BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     This invention relates generally to a resistance training exercise and fitness device, and more particularly, to a resistance training exercise device and method employing a governor system which strengthens the flexibility and elasticity of the device and prevents snapping or breaking of the cord. 
     2. Description of the Background Art 
     Resistance training is a popular form of exercise. Resistance training exercise devices known consist of a stretchable tube or cord with a pair of handles secured to opposing ends of the tube. To use this type of device, the user holds the handles and repeatedly stretches the tube, increasing the tension force in the tube, and retracts the tube while maintaining tension in the tube. However, resistance training devices such as these are very limited in application and structure and tend to break when stretched beyond the cord&#39;s capacity. 
     The present invention provides for a resistance training exercise cord device and system that accommodated the universal use of a plurality of different handles and straps with interchangeable elastic cords of varying levels of elasticity to change the work load and with a non-obstructive mechanism for limiting the length of the stretch to prevent the cord from breaking or snapping. 
     SUMMARY OF THE INVENTION 
     In light of the foregoing, in one embodiment, the present invention relates to a resistance training cord device having a plurality of interchangeable handles and straps. 
     In another embodiment, the present invention also relates to a resistance training elastic cord device having a tethered clip for interchanging handles, straps, bars, ropes and, or other components. 
     In yet another embodiment, the present invention provides for a resistance training elastic cord device having a clip tethered at each end of the cord for interchanging handles and straps. 
     In still another embodiment, the present invention relates to a resistance training elastic cord device having a clip tethered to each end of the cord by a structurally reinforced tether secured to each end of the cord. 
     In still yet another embodiment, the invention also relates to a resistance training elastic cord system having a plurality of interchangeable cords of varying elasticity, handles and straps. 
     In a further embodiment, the present invention provides for a method for using the resistance training elastic cord system for providing resistance exercise to enhance muscle strength and tone. 
     In yet a further embodiment, the present invention relates to a resistance training elastic cord device and system that is cost effective and convenient to use. 
     In still a further embodiment, the present invention provides for a resistance training elastic cord device having a limit mechanism that prevents stretching the device beyond a certain distance so it does not break. 
     In another further embodiment, the present invention further provides for a resistance training elastic cord device having a limit mechanism that does not interfere with a workout or result in a bulky device. 
     The instant invention provides a resistance training exercise device, system and method comprising at least one elastic, elongated and hollow cord with a tether secured to each end of the cord and a clip secured to the free end of the each tether. The cord comprises a rubber or rubber like material having a predetermined level of elasticity. It is the level of elasticity that dictates the tension force of the cord in pounds. Accordingly, the cord is assigned an average workout weight in pounds, which is marked on the cord&#39;s corresponding clip. Each tether is secured to its respective end of the cord by a grommet, plug and sleeve. The plug is inserted in each cord end to prevent the grommet from slipping off the cord. The sleeve fits around the plug and the end of the cord containing the plug. The sleeve may comprise a separate component or the end of the cord folded back over itself and the plug. The clips comprise an o-ring that receives the free end of the tether and a spring-loaded biasing flange for clipping onto a handle, strap or the cord itself. The handles and straps each comprise an o-ring for clasping by the clip. The handles are covered with foam for comfort. Likewise, the straps are padded for comfort. 
     In an alternative embodiment, the resistance training exercise device comprises a limit mechanism secured inside the elastic cord to prevent the cord from being stretched beyond a certain distance. The limit mechanism or band comprises a thin fabric or semi-elastic material having less elasticity or being substantially inelastic to stop the cord from stretching beyond the length of the band or predetermined point. The limit band has some elasticity, but less than the cord, so it does not bunch up in a relaxed cord. The limit band also has a higher tensile strength than the elastic cord. 
     The system of the instant invention comprises a plurality of cords with a clip tethered to each end, plurality of handles, and plurality of ankle or wrist straps. Each cord comprises a different level of elasticity or tension force measured in pounds for facilitating a desired workout. Each cord is color coded to indicate the “weight” of the cord. The system of the instant invention may further comprise a travel bag, user manual, workout guide and, or training video or DVD. 
     The method of resistance training in accordance with the instant invention comprises various exercises utilizing one or more cords and one or more handles or straps. The handles are used for stretching the cord with the hands. The straps are mounted to the wrists, ankles or stationary objects for stretching the cord. The user first determines the exercise to be performed. The user may reference the manual and guide for determining and designing exercise routines. Based on the exercise, the appropriate cord and handles or straps are selected and clipped to the tether or a clip may be clipped to the cord. Once the cord is properly prepared, a variety of exercises may be performed by stretching the cord and slowing the retraction of the cord to controllably release tension. For instance, the user may grasp a handle with each hand and stretch and slowly retract the cord across the chest, or stand in the middle of the cord and stretch the cord upward and outward. The user may clip one end of the cord to a door handle or hook and grasp a handle at the other end with one hand for repeatedly stretching the cord by pulling outward. The user may clip one end of the cord to a door handle or door anchor device and secure an ankle strap to the cord at the other end and place it around an ankle for repeatedly stretching the cord by moving the leg outward. The cord may be secured to a stationary object at one end by wrapping it around the stationary device and clipping it to itself. 
     In one embodiment, the present invention provides for an exercise device comprising: a stretchable cord having opposing first and second ends, the cord has an internal cavity and an external surface; at least two plugs, each plug is inserted within the internal cavity of the cord adjacent the first and second ends of the cord; at least two sleeves, each of the sleeves being placed over the external surface of the cord adjacent the first and second ends of the cord, each of the plugs is situated within a length of each of the sleeves; at least two tethers, each of the tethers has a stitched portion, the stitched portion forming two opposing compartments, a first compartment having at least one grommet and is designed to received at least one end of the cord with the sleeve and the plug, the grommet has a circumference that is smaller than a circumference of the cord with the sleeve, and the plug with at least a portion of the cord and at least a portion of the sleeve is situated generally within the first compartment of the tether; at least two carabineers, each of the carabineers has a bottom portion and a gate element; and at least two O-rings situated within each of the bottom portions of each of the carabineers, each of the O-rings is designed to receive a portion of the second compartment of each of the tethers. 
     In another embodiment, the present invention relates to a resistance exercise device comprising: a stretchable cord having opposing first and second ends, the cord has an internal cavity and an external surface; at least one plug is inserted within the internal cavity of the cord adjacent the first end of the cord; at least one sleeve is placed over the external surface of the cord adjacent the first end of the cord, the plug is situated within a length of the sleeve; at least one tether having a stitched portion, the stitched potion forms two opposing compartments, a first compartment has at least one grommet and is designed to received at least one end of the cord with the sleeve and the plug, the plug with at least a portion of the cord and at least a portion of the sleeve is situated generally within the first compartment of the tether, the second compartment forms a loop; at least one carabineer has a bottom portion and a gate element; and at least one O-ring is situated within the bottom portion of the carabineer, the O-ring is designed to receive a portion of the loop of the second compartment of the tether. 
     In a further embodiment, the present invention relates to a resistance exercise device comprising: a stretchable cord has opposing first and second ends, the cord has an internal cavity and an external surface, each of the first and second ends is folded over itself to create double layered ends; at least one plug is inserted within the internal cavity of the cord adjacent the first end of the cord, the plug is situated within a length of the double layered cord; at least one tether has a stitched portion, the stitched potion forms two opposing compartments, a first compartment has at least one grommet and is designed to received at least one end of the cord with the plug, the plug with at least a portion of the cord and at least a portion of the double layered cord is situated generally within the first compartment of the tether, the second compartment forms a loop; at least one carabineer has a bottom portion and a gate element; and at least one O-ring is situated within the bottom portion of the carabineer, the O-ring is designed to receive a portion of the loop of the second compartment of the tether. 
     In still another embodiment, the present invention provides for an exercise device comprising: a stretchable cord having opposing first and second ends, the cord having an internal cavity and an external surface; at least two sleeves, each of the sleeves being placed over the external surface of the cord adjacent the first and second ends of the cord, each of the plugs being situated within a length of each of the sleeves; at least two tethers, each of the tethers has a stitched portion, the stitched potion forms two opposing compartments, a first compartment has at least one grommet and is designed to received at least one end of the cord with the sleeve, the grommet has a circumference that is smaller than a circumference of the cord with the sleeve, at least a portion of the cord and at least a portion of the sleeve are situated generally within the first compartment of the tether; at least two carabineers, each of the carabineers has a bottom portion and a gate element; at least one limit band situated within the internal cavity of the cord; and a means for securing the limit band within the internal cavity of the cord, the means is situated within the cord and the sleeve. 
     In yet another embodiment, the present invention relates to a resistance exercise device comprising: a stretchable cord having opposing first and second ends, the cord has an internal cavity and an external surface; at least one plug is inserted within the internal cavity of the cord adjacent the first end of the cord; at least one sleeve is placed over the external surface of the cord adjacent the first end of the cord, the plug is situated within a length of the sleeve; at least one tether has a stitched portion, the stitched potion forms two opposing compartments, a first compartment has at least one grommet and is designed to received at least one end of the cord with the sleeve and the plug, the plug with at least a portion of the cord and at least a portion of the sleeve is situated generally within the first compartment of the tether, the second compartment forms a loop; at least one carabineer having a bottom portion and a gate element; and at least one limit band is situated within the internal cavity of the cord, the limit band has opposing ends, at least a portion of the first end of the limit band is secured to the plug. 
     In still yet another embodiment, the present invention discloses a resistance exercise device comprising: a stretchable cord having opposing first and second ends, the cord has an internal cavity and an external surface, each of the first and second ends is folded over itself to create double layered ends; at least one plug is inserted within the internal cavity of the cord adjacent the first end of the cord, the plug is situated within a length of the double layered cord; at least one tether has a stitched portion, the stitched potion forms two opposing compartments, a first compartment has at least one grommet and is designed to received at least one end of the cord with the plug, the plug with at least a portion of the cord and at least a portion of the double layered cord is situated generally within the first compartment of the tether, the second compartment forms a loop; at least one carabineer has a bottom portion and a gate element; and at least one limit band is situated within the internal cavity of the cord. 
     In a further embodiment, the present invention teaches a resistance exercise device comprising: a stretchable cord having opposing first and second ends, the cord has an internal cavity and an external surface; at least two sleeves, each of the sleeves is placed over the external surface of the cord adjacent the first and second ends of the cord, each of the plugs is situated within a length of each of the sleeves; at least two tethers, each of the tethers has a stitched portion, the stitched potion forms two opposing compartments, a first compartment has at least one grommet and is designed to received at least one end of the cord with the sleeve, the grommet has a circumference that is smaller than a circumference of the cord with the sleeve, at least a portion of the cord and at least a portion of the sleeve are situated generally within the first compartment of the tether; at least two carabineers, each of the carabineers has a bottom portion and a gate element; and at least one limit band is situated within the internal cavity of the cord, the limit band has opposing ends, at least one end of the limit band is attached to the bottom portion of one of the carabineers. 
     In one embodiment, the present invention provides for a exercise device comprising: a stretchable cord having opposing first and second ends, the cord having an internal cavity and an external surface; at least two plugs, each plug being inserted within the internal cavity of the cord adjacent the first and second ends of the cord; at least two sleeves, each of the sleeves being placed over the external surface of the cord adjacent the first and second ends of the cord, each of the plugs being situated within a length of each of the sleeves; at least two tethers, at least a portion of each of the tethers being closed thereby forming at least two opposing compartments, a first compartment having at least one grommet and is designed to received at least one end of the cord with the sleeve and the plug, the plug with at least a portion of the cord and at least a portion of the sleeve being situated generally within the first compartment of the tether; and at least two carabineers, each of the carabineers having a bottom portion and a gate element, the bottom portion of each of the carabineers is designed to receive a portion of the second compartment of each of the tethers. 
     In another embodiment, the first and second compartments of the tether form loops having an internal diameter, and the diameter of the first compartment is larger than the diameter of the second compartment. 
     In yet another embodiment, each of the bottom portions of the carabineer having a closed area, the closed area of the bottom portions of the carabineers is designed to receive a portion of the second compartment of each of the tethers. 
     In still another embodiment, the tether is closed by a stitched portion, the stitched portion provides for reinforcement in strengthening the tether and the device when the cord is stretched. In still yet another embodiment, the sleeve, the tether with the compartments and the plug assist in preventing the cord from breaking and snapping during stretching of the cord. 
     In a further embodiment, the plug is situated within the first compartment of the tether and prevents the end of the cord and at least a portion of the sleeve from passing the grommet when the cord is stretched. 
     In another further embodiment, the diameter of the second compartment is a size that allows the loop to fit around the bottom portion of the carabineer and be a size that limits movement of the loop around the bottom portion of the carabineer. 
     In yet a further embodiment, the diameter of the first compartment is from about 5 to about 95% larger than the diameter of the second compartment of the tether. 
     In still a further embodiment, the present invention provides for a resistance exercise device comprising: a stretchable cord having opposing first and second ends, the cord having an internal cavity and an external surface; at least one plug being inserted within the internal cavity of the cord adjacent the first end of the cord; at least one sleeve being placed over the external surface of the cord adjacent the first end of the cord, the plug being situated within a length of the sleeve; at least one tether, at least a portion of the tethers being closed thereby forming at least two opposing compartments, a first compartment having at least one grommet and is designed to received at least one end of the cord with the sleeve and the plug, the plug with at least a portion of the cord and at least a portion of the sleeve being situated generally within the first compartment of the tether; and at least one carabineer having a closed bottom portion and a gate element, the closed bottom portion being designed to receive a portion of the second compartment of the tether. 
     In yet still a further embodiment, the device further comprises a second plug and a second sleeve, the second plug being inserted within the internal cavity of the cord adjacent the second end of the cord, the second sleeve being placed over the external surface of the cord adjacent the second end of the cord, the second plug being situated within a length of the second sleeve. 
     In another embodiment, the device further comprises a second tether, at least a portion of the second tether being closed thereby forming at least two opposing compartments, a first compartment having at least one grommet and is designed to received at least one end of the cord with the second sleeve and the second plug, the second plug with at least a portion of the cord and at least a portion of the second sleeve being situated generally within the first compartment of the tether, the second compartment forming a loop. 
     In yet another embodiment, the device further comprises a second carabineer having a closed bottom portion and a gate element, the closed bottom portion of the second carabineer being designed to receive a portion of the second compartment of the second tether. 
     In still another embodiment, the device further comprises an apparatus designed to be attached to the carabineer for providing multiple exercise options, the apparatus being selected from a group consisting essentially of handles, loops, straps, bands, rings, rope, grips and combinations thereof. In another further embodiment, the tether comprises straps. In a further embodiment, the device further comprises a plurality of combinable devices to form a system. 
     In another embodiment, the present invention relates to a resistance exercise device comprising: a stretchable cord having opposing first and second ends, the cord having an internal cavity and an external surface, each of the first and second ends being folded over itself to create double layered ends; at least one plug being inserted within the internal cavity of the cord adjacent the first end of the cord, the plug being situated within a length of the double layered cord; at least one tether having a stitched portion, the stitched potion forming two opposing compartments, a first compartment having at least one grommet and is designed to received at least one end of the cord with the plug, the plug with at least a portion of the cord and at least a portion of the double layered cord being situated generally within the first compartment of the tether, the second compartment forming a loop; at least one carabineer having a bottom portion and a gate element, the bottom portion is designed to receive a portion of the loop of the second compartment of the tether; and at least one limit band situated within the internal cavity of the cord. 
     In accordance with these and other embodiments, the present invention will now be described with particular reference to the accompanying drawings. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The accompanying drawings are included to provide a further understanding of the present invention. These drawings are incorporated in and constitute a part of this specification, illustrate one or more embodiments of the present invention and together with the description, serve to explain the principles of the present invention. 
         FIG. 1  is a perspective view of the resistance training exercise device in accordance with another embodiment of the instant invention. 
         FIG. 2  is a side perspective view of the resistance training exercise device in accordance with another embodiment of the instant invention; 
         FIG. 3  is a partial cross-sectional view and elevational view of the resistance training exercise device in accordance with another embodiment of the instant invention; 
         FIG. 4  is a partial cross-sectional view and elevational view of the resistance training exercise device in accordance with the alternative embodiment of the instant invention; 
         FIG. 5  is a perspective view of the resistance training exercise device with an ankle or wrist strap in accordance with another embodiment of the instant invention; 
         FIG. 6  is a perspective view of the resistance training exercise device with a handle in accordance with another embodiment of the instant invention; 
         FIG. 7  is a perspective view of the resistance training exercise device with an anchor strap secured to a door in accordance with another embodiment of the instant invention; 
         FIG. 8  is a perspective view of the resistance training exercise device with an ankle or wrist strap in use in accordance with another embodiment of the instant invention; 
         FIG. 9  is a perspective view of the resistance training exercise device with a handle in use in accordance with another embodiment of the instant invention; 
         FIG. 10  is a partial cross-sectional view and perspective view of the resistance training exercise device illustrating the limit band inside the elastic cord in accordance with a further embodiment of the instant invention; 
         FIG. 11  is a partial cross-sectional view and perspective view of the resistance training exercise device illustrating the limit band inside the elastic cord with hook for attaching the band to the plug in accordance with another further embodiment of the instant invention; 
         FIG. 12  is a partial cross-sectional view and perspective view of the resistance training exercise device illustrating the limit band inside the elastic cord and a protective cylinder inside the plug in accordance with yet a further embodiment of the instant invention; 
         FIG. 13  is a partial cross-sectional view and elevational view of the resistance training exercise device illustrating the limit band inside the elastic cord and a ball stopper and the limit band passing through the ball in accordance with another embodiment of the instant invention; 
         FIG. 14  is a partial cross-sectional view and elevational view of the resistance training exercise device illustrating the limit band inside the elastic cord and a ball stopper and the limit band passing around the ball in accordance with yet another embodiment of the instant invention; 
         FIG. 15  is a diagram and partial elevational view of the resistance training exercise device illustrating the limit band inside the elastic cord and secured to an opening to a clip or handle in accordance with still another embodiment of the instant invention; 
         FIG. 16  is a diagram and partial elevational view of the resistance training exercise device illustrating the limit band inside the elastic cord and secured through an opening to a clip or handle in accordance with still yet another embodiment of the instant invention; 
         FIG. 17  is a diagram and partial elevational view of the resistance training exercise device illustrating the limit band inside the elastic cord and secured through an opening to a post of a clip in accordance with a further embodiment of the instant invention; 
         FIG. 18  is a diagram and partial elevational view of the resistance training exercise device illustrating the limit band inside the elastic cord and secured to a tapered plug in accordance with another further embodiment of the instant invention; 
         FIG. 19  is a diagram and partial elevational view of the resistance training exercise device illustrating the limit band inside the elastic cord and secured to the clip through a tapered plug in accordance with yet another further embodiment of the instant invention; 
         FIG. 20  is a diagram and partial elevational view of the resistance training exercise device illustrating the limit band inside the elastic cord and secured to a clip, strap or handle in accordance with still another further embodiment of the instant invention; 
         FIG. 21A-C  are diagrams and partial elevational views of the handle, strap and clip used in accordance with yet still another further embodiments of the instant invention; 
         FIG. 22A-B  are frontal views of another embodiment of the device of the present invention showing a carabineer and the second compartment of the tether attached to said carabineer; 
         FIG. 23  is a frontal view of the carabineer of  FIG. 22  with the limit band; 
         FIGS. 24A-B  are frontal views of another further embodiment of the device with a carabineer with a closed area or compartment and the second compartment of the tether attached to said carabineer; 
         FIG. 25  is a frontal view of the carabineer of  FIG. 24  with the limit band; 
         FIG. 26  is a perspective view of the extensive sleeve grip embodiment; 
         FIG. 27  is a side view of the limit band and ball embodiment; and 
         FIG. 28  is a cross section view of the plug with the limit band and attached ball. 
     
    
    
     Among those benefits and improvements that have been disclosed, other objects and advantages of this invention will become apparent from the following description taken in conjunction with the accompanying drawings. The drawings constitute a part of this specification and include exemplary embodiments of the present invention and illustrate various objects and features thereof. 
     DETAILED DESCRIPTION OF THE INVENTION 
     As required, detailed embodiments of the present invention are disclosed herein; however, it is to be understood that the disclosed embodiments are merely exemplary of the invention that may be embodied in various forms. The figures are not necessarily to scale, some features may be exaggerated to show details of particular components. Therefore, specific structural and functional details disclosed herein are not to be interpreted as limiting, but merely as a basis for the claims and as a representative basis for teaching one skilled in the art to variously employ the present invention. 
     With reference to the drawings,  FIGS. 1 to 21C  depict various embodiments of the instant invention which is generally referenced as a resistance training exercise device, system or method and, or by numeric character  10 . The instant invention  10  comprises a resistance training exercise device, system and method that enables multiple exercises by providing and facilitating use of a plurality of interchangeable cords, handles and straps. 
     With reference to  FIG. 1-21C , various embodiments of the resistance training exercise device  10  of the instant invention comprises an elastic, elongated and hollow cord  12 , a tether  16  secured to each end of the cord  12  and a clip  30  secured to the free end of each tether  16 . The cord  12  comprises a rubber or rubber like material having a predetermined level of elasticity corresponding to the amount of pulling force needed to stretch the cord a certain distance. The level of elasticity resistance in the cord dictates the tension force of the cord, which is represented in pounds. Accordingly, the cord  12  is designed with an average workout weight in pounds based on the cords modules of elasticity, which is indicated on the cord&#39;s corresponding clip  30  by indicia  31 . Each tether  16  preferably comprises a nylon or nylon-like material that is secured to a corresponding end of the cord  12 . Each tether  16  is sewn with stitching  17  in a mid-section to form a loop at each end for receiving and holding a corresponding clip  30  end and cord end  12 , respectively. A clip  30  is secured to the free end of each tether  16  for attaching to a handle  40 , ankle or wrist strap  50 , rope, bar or other attachment or to the cord  12 . The handle  40  preferably comprises an o-ring  42  for connecting to the clip  30 , a support extension  43  with a loop for receiving and containing the o-ring  42  and a foam pad  44  around the gripping portion of the handle  40 . Likewise, the ankle or wrist strap  50  preferably comprises an o-ring  52  for connecting to the clip  30 , a support extension  53  with a loop for receiving and containing the o-ring  52  and a padded belt  54  for receiving and engaging an ankle or wrist. 
     Referring to  FIGS. 3 and 4 , the tethers  16  are each secured to its respective end of the cord  12  by a grommet  19 , plug  18  and strain-relief sleeve  20 . The plug  18  is inserted in the hollow passage  13  of each cord  12  proximal one end to block the grommet  19  from slipping off the cord. The sleeve  20  fits tightly over the end of the cord  12  containing the plug  18  to reinforce the cord  12  and plug  18  and increase its stress and strain tolerance. The sleeve  20  preferably comprises an elastic sleeve that stretches and mounts over the cord  12  segment containing the plug  18  conforming to its shape to reinforce and increase the tolerance level of stress, strain and, or sheering forces, as shown in  FIG. 3 . In an alternative embodiment, the sleeve  20  may be formed by and comprise a portion of the cord  12  folded back over its segment containing the plug  18  in a manner that conforms to the cord  12  and plug  18  to enhance the tolerance level of strain, stress and, or sheer forces, as shown in  FIG. 4 . 
     With reference to  FIG. 1-9 , the clips  30  comprise a hooked body  32 , a spring-loaded or biasing member  34  pivotally secured in or over the opening of the hook body  32  to a smaller tether-connecting end  36  having an opening or aperture that receives and supports a corresponding end of the tether  16 . The tether end  36  may contain an o-ring  38  in its opening that receives the same tether end for reinforcement and smooth support of the tether  16  in a manner that reduces friction and the risk of damage during exercise. Access to the opening in the clip  30  is controlled by the biasing member  34 , which facilitates clipping to a handle  40  or strap  50 . The handle o-ring  42  or strap o-ring  52  passes through the biasing member  34  and slides over the clip body  32 . 
     With reference to  FIG. 1-9 , the resistance training exercise system  10  of the instant invention comprises a plurality of cords  12  with a tether  16  and clip  30  at each end, plurality of handles  40  and plurality of ankle or wrist straps  50 , bars and, or ropes. The system  10  may comprise an anchor strap  60  with an anchor  62 , as shown in  FIG. 7 . As shown, the anchor  62  comprises a disk secured by or mounted to the anchor end of the strap  60 . Each cord  12  comprises a different level of elasticity resistance or tension force measured in pounds for facilitating various levels of resistance in accordance with desired workouts. Each cord  12  is preferably color coded to indicate the “weight” of the cord  12 , which may also be set forth by indicia  31  on the clip  30 . The system of the instant invention  10  may further comprise a travel bag, user manual, workout guide and, or training video or DVD. 
     With reference to  FIGS. 8 and 9 , the resistance training exercise method  10  of the instant invention comprises various exercises utilizing one or more cords  12  and one or more handles  40 , ankle/wrist straps  50  or anchor straps  60  and anchors  62 . The handles  40  are used for stretching the cord with the hands. The straps  40  are mounted to the wrists or ankles for stretching the cord. The anchor strap  60  may be mounted to a hook, door strap or door knob or to an anchor  62 , as shown in  FIG. 7 . The user first determines the exercise to be performed. The user may reference the manual and guide for determining and designing exercise routines. Based on the exercise, the appropriately weighted cord  12  and handles  40  or straps  50  or  60  are selected and clipped to the tether  16  by the clips  30 . The cord  12  may be wrapped around a secure stationary object and clipped to itself with the clip  30 . The cord  12  may be threaded through a loop of a door or anchor strap  60  and to handles  40  or ankle straps  50 . Once the cord  12  is properly prepared, a variety of exercises may be performed by stretching the cord and slowing the retraction of the cord so as to controllably release tension. For instance, the user may grasp a handle  40  with each hand and stretch and slowly retract the cord&#39;s  12  tension across the chest, or stand in the middle of the cord  12  and stretch the cord  12  upward and outward. The user may clip one end of the cord  12  to a door handle or hook and grasp a handle  40  at the other end with one hand while repeatedly stretching the cord  12  with a pulling motion. The user may clip one end of the cord  12  with the clip  30  to a door handle and secure a strap  50  to the other cord clip  30  at the opposite end and place it around an ankle or wrist for repeatedly stretching the cord  12  by moving the leg or arm outward. The cord  12  may be wrapped around a stationary object and secured by engaging the corresponding clip  30  with the cord  12 , while a handle  40  or strap  50  is clipped at the opposite end. 
     With reference to  FIG. 10-21C , the alternative embodiments of the instant invention  10  comprise an elastic, elongated and hollow cord  12 , a tether  16  secured to each end of the cord  12 , a clip  30   a  and a limit band  80  secured within the elastic cord  12  to limit the stretching of the cord  12  to a predetermined length to prevent the elastic cord  12  from breaking. The limit band  80  comprises a thin fabric or semi-elastic material having substantially less elasticity or being substantially inelastic to stop the elastic cord from stretching beyond its break point or some other predetermined stretch point limit. The limit band  80  has a higher tensile strength than the elastic cord  12  to stop the cord from stretching without the band  80  breaking. The limit band  80  preferably has some elasticity so its does not bunch up in the cord  12  when it is relaxed. 
     Still referring to  FIG. 10-21C , the limit band  80  may be secured in the elastic band  12  through the plug  18 , to the plug  18  or to a clip  30 , handle  40  or loop  70 . With reference to  FIG. 10 , the limit band  80  disposed in the cord  12  is preferably secured through the plug  18  by passing it through a channel formed in the plug  18  and tying the end of the band  80  into a knot  82  or securing it to a knob-like object. The preferred embodiment of the resistance training device  10  with a limit band  80 , also comprises a metal or plastic washer  84  having a center aperture  86  through which the band  80  passes. The washer  84  provides reinforcement to the plug  18  and structural integrity and has a center aperture  86  that is smaller than the knot or knob  82 . With reference to  FIG. 12 , in another alternative embodiment, the resistance training device  10  with a limit band  80  includes a rigid cylinder  88  in the center of the plug  18 . The limit band  80  passes through the cylinder  88 . The cylinder  88  reduces friction and prevents the band  80  from rubbing against the plug  18 , thereby reducing wear and tear. The cylinder  88  also structurally reinforces the plug  18 . 
     With reference to  FIG. 11 , in another alternative embodiment, the resistance training device  10  with a limit band  80  comprises a plug  18 , a hook  87  attached or secured to the bottom end of the plug  80  and a limit band  80  attached to the hook  87 . The band  80  may also be attached to the plug  18 . In this embodiment, the plug  18  may alternatively include a cylinder  88 , as described herein. 
     With reference to  FIG. 13 , in another alternative embodiment, the resistance training device  10  with a limit band  80  comprises a spherical or spherical-like plug  18 . The limit band  80  disposed in the cord  12  is secured through the spherical plug  18  by passing it through a channel formed in the plug  18  and tying the end of the band  80  into a knot  82  or securing it to a knob-like object. In this embodiment, the spherical plug  18  may alternatively include a cylinder  88  and, or washer  89 , as described herein. 
     With reference to  FIG. 14 , in another alternative embodiment, the resistance training device  10  with a limit band  80  comprises a spherical or spherical-like plug  18 . The limit band  80  disposed in the cord  12  is disposed outside the spherical plug  18  and secured by tying the end of the band  80  into a knot  82  or securing it to a knob-like object. In this embodiment, the band  80  is sandwiched between the plug  18  and elastic cord  12 . 
     With reference to  FIG. 15 , in another alternative embodiment, the resistance training device  10  comprises a limit band  80  disposed in the cord  12  and secured directly to the lower end of the clip  30  and clip lower end aperture  36 , handle  40  or strap  50 . With reference to  FIG. 16 , the resistance training device comprises a limit band  80  disposed in the cord  12  and passing through the clip lower end aperture  36  for attachment to the clip  30 , handle  40  or strap  50 . 
     With reference to  FIG. 17 , in another alternative embodiment, the resistance training device  10  with a limit band  80  comprises a clip  30 , handle  40  or strap  50  secured directly to the limit band  80 . The limit band  80  disposed in the cord  12  is to the aperture  36  at the lower end of the clip  30 , handle  40  or strap. 
     With reference to  FIG. 18 , in another alternative embodiment, the resistance training device  10  with a limit band  80  comprises a clip  30 , tapered adapter  92  extending from the clip  30 , tapered plug  90  disposed in the adapter  92  and limit band  80  secured to the tapered adapter  90 . The elastic cord  12  penetrates the adapter  92  between the tapered plug  90  and interior walls of the adapter  92  such that the cord  12  is secured to the clip  30  within the adapter  92 . In other alternative embodiments, the clip  30  may be replaced with a handle  40  or strap  50 . 
     With reference to  FIG. 19 , in another alternative embodiment, the resistance training device  10  with a limit band  80  comprises a clip  30 , tapered adapter  92  extending from the clip  30 , tapered plug  90  disposed in the adapter  92  and limit band  80  passing through a channel formed in the tapered plug  92  and secured to the lower end aperture  36  of the clip  30 . The elastic cord  12  penetrates the adapter  92  between the tapered plug and interior walls of the adapter  92  such that the cord  12  is secured to the clip  30  within the adapter  92 . The tapered plug  90  may include a cylinder  88  passing through the center of the plug  90  to form a passage with less friction. In this embodiment, the spherical plug  18  may alternatively include a cylinder  88  and, or washer  93 , as described herein. In other alternative embodiments, the clip  30  may be replaced with a handle  40  or loop  70 , as depicted in  FIG. 20 . With reference to  FIG. 21A-C , the instant invention is adapted for clips  30 , handles  40  and straps  50 . 
     As shown in  FIGS. 3-4  and now referring now to  FIGS. 22A-B , another embodiment of the device of the present invention comprises a carabineer  101  with a top portion  101   a  and a bottom portion  101   b  and a movable gate element  102 . At least a portion of the second compartment  112  of the tether  110  is attached to the bottom portion  101   b  of the carabineer  101 . 
       FIG. 23  depicts a limit band  109  attached to the bottom portion  101   b  of the carabineer  101 . 
     Referring now to  FIGS. 24A-B , a further embodiment of the device of the present invention comprises a carabineer  101  with a top portion  101   a  and a bottom portion  101   b  and a movable gate element  102 . The bottom portion  101   b  has a closed compartment or area  103  forming an aperture  104 . At least a portion of the second compartment  112  of the tether  110  is situated within the aperture  104  of the closed area  103  of the bottom portion  101   b  of the carabineer  101 .  FIG. 25  depicts a limit band  109  attached to the closed area or compartment  103  of the bottom portion  101   b  of the carabineer  101 . 
       FIG. 26  is a perspective view of one of the embodiments of the invention showing the tether  210  with compartments,  210   a  and  210   b  respectively. At least a portion of an attachment device  201  is attached to a portion of the compartment  210   a . At least a portion of the sleeve  220 , cord  212  and the plug (not shown) is situated within a portion of the compartment  210   b . The sleeve  212  is extended so that it may function as a handle or grip. The sleeve  212  may have a pattern or design on its external surface to assist with its gripping function. 
       FIGS. 27 and 28  illustrate the limit band  218  attached to a ball  219  and as shown in  FIG. 28 , at least a portion of the ball  219  with the attached limit band  218  is situated with the plug  206 . 
     Numerous modifications and variations of the present invention are possible in light of the above teachings. It is therefore to be understood that within the scope of the attendant claims attached hereto, this invention may be practiced otherwise than as specifically disclosed herein.