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An exercise device having a water-tight, interior compartment into which a destabilizing liquid can be added to fill the device to a desired weight, such as by indicated on weight marks provided on an exterior surface of the exercise device. The device is capable of being filled with the destabilizi

An exercise device having a water-tight, interior compartment into which a destabilizing liquid can be added to fill the device to a desired weight, such as by indicated on weight marks provided on an exterior surface of the exercise device. The device is capable of being filled with the destabilizing liquid via a water port of the device, which may be releasably securable to a water hose or faucet. The destabilizing liquid filling the interior compartment of the exercise device provides resistance to muscular movement and provides destabilization of the device as an aid in improving a user's balance and coordination. Handles and/or at least one protruding knob are provided on the exterior surface of the exercise device, and/or padded straps are provided on the exterior surface of the exercise device for attaching the device to the user's limbs or back. One side of the device may be flattened and padded to increase comfort for the user when the device is attached to the user's body.

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1. An exercise device, comprising: an outer membrane forming a generally spherical, water-tight interior compartment capable of being filled with a sufficient volume of a destabilizing liquid to impose a workload on a user's body during exercise, said outer membrane being constructed of a moldable,

1. An exercise device, comprising: an outer membrane forming a generally spherical, water-tight interior compartment capable of being filled with a sufficient volume of a destabilizing liquid to impose a workload on a user's body during exercise, said outer membrane being constructed of a moldable, non-rupturable, thermoplastic polymer material having a sufficient durometer, tensile strength and density to allow said exercise device to be used in dynamic exercises when filled with said destabilizing liquid without tearing, bursting, rupturing or leaking, said outer membrane constructed having no internal bladder, baffles or other means to stabilize or impede movement of said destabilizing liquid within said interior compartment, resulting in a predictable direction of flow of said destabilizing liquid, allowing said user to adjust for an anticipated direction of flow of said destabilizing liquid during said exercise with said exercise device;a handle integrated with an exterior surface of said outer membrane;a knob integrated with said exterior surface of said outer membrane;two shoulder straps secured to said exterior surface of said outer membrane in spaced apart relationship so that each strap forms a loop for receiving the arm of said user, each shoulder strap secured to a separate horizontal chest strap via one end of said horizontal chest strap, and an opposite free end of each of said chest straps provided with a hook and loop fastener; andan inlet port in fluid communication with said interior compartment formed by said outer membrane;wherein the destabilizing liquid provides weight resistance to muscular movement in order to build muscle and provides destabilization of said exercise device as an aid in improving said user's balance and coordination by working said user's stabilizing muscles. 2. The exercise device of claim 1 wherein said outer membrane, said handle and said knob form a unitary, contiguous exercise device. 3. The exercise device of claim 1 wherein said outer membrane is transparent or translucent through which said volume of said destabilizing liquid contained within said interior compartment of said exercise device can be discerned. 4. The exercise device of claim 1 wherein said outer membrane has a density range of approximately 0.040 to approximately 0.050 lbs./cubic inch, with a minimum tensile yield strength of approximately 2500 lbs./square inch minimum and a durometer range of approximately 40 to approximately 90 Shore A. 5. The exercise device of claim 4 wherein said density range of said outer membrane is approximately 0.42 to approximately 0.43 lbs./cubic inch and a durometer range of approximately 50 to approximately 60 Shore A. 6. The exercise device of claim 1 wherein said outer membrane is fairly rigid and not stretchable, flexible or collapsible to a significant degree. 7. The exercise device of claim 1 wherein said interior compartment formed by said outer membrane has a fluid capacity of approximately 5.57 gallons. 8. The exercise device of claim 2 wherein said exterior surface of said outer membrane, said handle and/or said knob are textured to provide for increased grip. 9. The exercise device of claim 1 wherein said exterior surface of said outer membrane has horizontal marking lines to indicate the weight of said exercise device with differing volumes of said destabilizing liquid. 10. The exercise device of claim 1 wherein said handle is constructed of a textured, moldable, polymer material having a density and durometer similar to that of said outer membrane. 11. The exercise device of claim 1 wherein said handle and said knob are attached at diametrically opposite points on said exterior surface of said outer membrane. 12. The exercise device of claim 1 wherein said handle is a plurality of handles. 13. The exercise device of claim 12 wherein said plurality of handles are integrated to said exterior surface of said outer membrane at approximately 90 and approximately 180 degree orientations relative to each other. 14. The exercise device of claim 12 wherein said plurality of handles are two handles integrated in diametric opposition to each other on the sides of said exterior surface of said outer membrane. 15. The exercise device of claim 12 wherein said plurality of handles further comprises a first handle and a second handle attached at antipodal points on said exterior surface of said outer membrane and a third handle attached along a great circle arc between said antipodal points on said exterior surface of said outer membrane. 16. The exercise device of claim 2 wherein said knob is mushroom-shaped having a stem portion that widens to a dome portion. 17. The exercise device of claim 16 wherein said dome portion of said knob is sized to allow the palm of said user's hand to cover said knob while allowing just the fingers of said user's hand to curl under said dome portion during grip strengthening exercises resulting in less ergonomic grip, forcing said user to directly engage the smaller muscle groups of the flexor carpi radialis, flexor carpi ulnaris and/or brachioradialis of the forearms and hands. 18. The exercise device of claim 16 wherein said stem portion of said knob elevates said dome portion away from said exterior surface of said outer membrane a distance sufficient to allow the fingers of said user's hand to curl under said dome. 19. The exercise device of claim 16 wherein said knob is constructed of a textured, moldable, polymer material having a density and durometer similar to that of said outer membrane. 20. The exercise device of claim 16 wherein said knob is a plurality of knobs. 21. The exercise device of claim 20 wherein said plurality of knobs are integrated with said exterior surface of said outer membrane at approximately 90 and approximately 180 degree orientations relative to each other. 22. The exercise device of claim 20 wherein said plurality of knobs further comprises a first protruding knob and a second protruding knob attached at antipodal points on said exterior surface of said outer membrane and a third protruding knob along a great circle arc between said antipodal points on said exterior surface of said outer membrane. 23. The exercise device of claim 1 wherein said inlet port is an air valve in fluid communication with said interior compartment for insertion or removal of an amount of air into said interior compartment in order to eliminate any minor dimpling of said outer membrane. 24. The exercise device of claim 1 wherein said inlet port is a water port in fluid communication with said interior compartment to fill or empty said interior compartment with said destabilizing liquid. 25. The exercise device of claim 24 wherein said water port is recessed into said exterior surface of said outer membrane and further comprises a rounded edge in order to eliminate any cutting or discomfort from said edge when closing said water port or during exercise with said exercise device. 26. The exercise device of claim 24 wherein said water port further comprises a receptacle having internal tapered screw threads, a plug having external treads similar to said screw threads of said receptacle, and a gasket capable of being placed intermediate of the mating surfaces of said receptacle and said plug to form a seal to prevent leakage of said destabilizing liquid from said interior compartment. 27. The exercise device of claim 1 wherein said destabilizing liquid is water. 28. The exercise device of claim 1 wherein said outer membrane further comprises a flattened side, one end of each of two pieces of a strap secured to opposed edges of said flattened side and opposite free ends of said two pieces of said strap provided with hook and loop fasteners to allow said strap to secure said exercise device to said user's limbs. 29. The exercise device of claim 28 wherein said flattened side and/or said strap is padded. 30. The exercise device of claim 1 wherein each of said shoulder straps comprises two pieces that are connected by an adjustment mechanism for adjusting the length of said shoulder strap.