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An exercise device comprising a foot carriage slideably mounted on tracks, the tracks are held together parallel to one another and resistance elements provide opposition against the relative motion of the foot carriage. The foot carriage can be a frame carrying wheels and a foot support.

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1. An exercise device, comprising: a) a track assembly comprising a plurality of tracks each having a first end, a second end, and a length, where the tracks are held parallel to one another;b) a foot carriage with a first and second end having a plurality of wheels mounted thereto in such a manner

1. An exercise device, comprising: a) a track assembly comprising a plurality of tracks each having a first end, a second end, and a length, where the tracks are held parallel to one another;b) a foot carriage with a first and second end having a plurality of wheels mounted thereto in such a manner as to enable said foot carriage to roll along said track assembly, where the first end of the foot carriage is in proximity to the first end of the track assembly and the second end of the foot carriage is in proximity to the second end of the track assembly; andc) a plurality of resistance elements which impede the movement of the foot carriage along the track assembly;where the foot carriage comprises a frame and a foot support; andwhere the foot support is slidably removable from the frame. 2. The exercise device of claim 1 in which the tracks are held parallel to one another by an end cap on each end of the tracks, which end caps enclose the ends of the tracks. 3. The exercise device of claim 1 in which the tracks are held parallel to one another by a plurality of connectors located at the ends of the tracks. 4. The exercise device of claim 1 in which the track assembly is made out of one integral piece comprising a plurality of tracks. 5. The exercise device of claim 1 in which the resistance elements which impede the movement of the foot carriage along the track assembly each have a first end and a second end, and where the first resistance element has its first end releasably attached to the first end of the track assembly and its second end releasably attached to the first end of the foot carriage, and where a second resistance element has its first end releasably attached to the second end of the track assembly and its second end releasably attached to the second end of the foot carriage. 6. The exercise device of claim 1, where in the frame comprises walls, wherein the wheels are mounted within the walls of the frame, wherein said tracks define channels, and in which the wheels mounted within the walls of the frame can travel. 7. The exercise device of claim 6, in which a plurality of the wheels are disposed to travel along the lower portion of the surface of the interior of the channel. 8. The exercise device of claim 6, in which a plurality of the wheels are disposed to travel along the upper portion of the surface of the interior of the channel. 9. The exercise device of claim 6, wherein at least one longitudinal ridge extends along the interior of the channels. 10. The exercise device of claim 1, wherein said frame comprises a structure for slidably receiving and holding said foot support and for carrying a plurality of wheels. 11. The exercise device of claim 1, wherein said foot support comprises a top portion in the form of a flat surface shaped to receive the user's foot and a bottom structure having a front and a rear end; wherein the bottom structure is configured for engaging with said frame; where the bottom structure has open slots disposed on both the front end and the rear end; and where when the bottom structure is engaged with the frame, the frame and the bottom structure combine to define a hole at each of the first end and the second end of the foot carriage assembly. 12. The exercise device of claim 1, wherein the frame comprises walls, wherein said foot carriage carries axles on which are rotatably mounted said plurality of wheels within the walls of said frame of the foot carriage assembly. 13. The exercise device of claim 1, wherein said resistance elements comprise elastic tubes that each have a first end and a second end and where a washer encircles each of the second ends of the elastic tubes, and where a plug is disposed adjacent to the washer and within the channel defined by the tubes toward the second end of the tubes, releasably securing the washer to the elastic tubes. 14. The exercise device of claim 1, wherein said resistance elements comprise a plurality of strips each having a hole disposed in the center of the strip, where the first end of each of the elastic tubes extends through the hole disposed within the center of the strip and where the strip has a first end and a second end which are releasably securable to each other. 15. The exercise device of claim 14 where a plug is disposed adjacent to the strip and within the channel defined by the tubes and toward the terminus of the tubes, releasably securing the strip to the elastic tubes. 16. The exercise device of claim 15, wherein said strip has a grommet disposed about said hole, and where the grommet has an inside diameter less than the outside diameter of the plug that is disposed within the channel at the first end of the elastic tube. 17. The exercise device of claim 13, wherein said washer defines a hole and where the diameter of said hole is less than the outside diameter of said plug. 18. The exercise device of claim 13, wherein said elastic tubes include sleeves disposed about the portions of the second ends of said elastic tubes that extend through the hole of said washer. 19. The exercise device of claim 14, wherein said elastic tubes include sleeves disposed about the portions of the first ends of said elastic tubes that extend through the hole of said strip. 20. The exercise device of claim 13, wherein the foot carriage has openings disposed in the front and rear portions of it, which openings are dimensioned so that the washer cannot fit through the hole. 21. The exercise device of claim 20, wherein each of the second ends of said resistance elements extends through the one of the holes from the exterior of the foot carriage to the interior in such a way that the plugs and washers are held in the interior portion of the foot carriage while the first end is on the exterior portion of the foot carriage. 22. The exercise device of claim 2, where the end cap has a plurality of slots disposed on the end cap for releasably securing the plurality of resistance elements. 23. The exercise device of claim 14, wherein said first and second ends of the strip releasably secure to each other by means hook and loop fasteners. 24. The exercise device of claim 14, wherein said first and second ends of the strip releasably secure to each other by means of a buckle. 25. The exercise device of claim 1 further comprising at least one pad of non-slip material secured to the bottom portion of the exercise device. 26. The exercise device of claim 1 in which the resistance elements comprise a plurality of magnets, a plurality of reaction plates attached to the track assembly, and at least one magnet holders, each with a first end and a second end where at least one magnet holder is attached to the foot carriage. 27. The exercise device of claim 26, wherein said resistance elements have at least one cross bar with a first end and a second end located at the first end of the foot carriage where the cross bar has its first end attached to the first end of the first magnet holder and its second end attached to the first end of the second magnet holder and where at least one cross bar located at the second end of the foot carriage and has its first end attached to second end of the first magnet holder and its second end attached to the second end of the second magnet holder. 28. The exercise device of claim 26, wherein said magnets have a longitudinal groove along their lengths. 29. The exercise device of claim 27, wherein said cross bar contains a pair of magnet arms for which their first ends define tabs capable of being attached to the ends of the magnets and their second ends define racks meshing with a pinion that is rotatably mounted to the cross bar. 30. The exercise device of claim 29, wherein said resistance elements comprise further a lever which having a first end attached to the pinion and used as a pivot point and an opening at a distance from the first end. 31. The exercise device of claim 30, wherein said resistance device comprises further a dial attached to the cross bar and defines a plate having a plurality of bosses along an arc centered at the pinion axis where the bosses are situated in a location such that they can fit into the opening in the lever to lock the mechanism into a particular position. 32. The exercise device of claim 1 in which the resistance elements comprise at least one electro-magnet attached to magnet holders and having longitudinal grooves in which reaction plates are slideably located without contact. 33. The exercise device of claim 32, wherein said resistance elements comprises a circuit board electrically connected to the electro-magnets and a control device connected to the circuit board. 34. The exercise device of claim 1, wherein the frame further comprises a peripheral wall extending around the periphery of the frame, wherein the frame comprises a plurality of subsidiary walls, wherein the plurality of subsidiary walls and the peripheral wall combine to define a plurality of apertures, and wherein each of the wheels are mounted within an aperture. 35. The exercise device of claim 2, wherein said end cap comprising a housing with a wall thickness and a plurality of ribs and having side, bottom and top panels where the tracks are attached to the inside surface of the end cap. 36. The exercise device of claim 1, wherein said frame having raised wall periphery with gussets supporting the portion of the frame structure with said apertures where the wheels are mounted.