Patent ID: 8500611

Claim:
A portable device for performing exercises, comprising: two independent tracks with a physical connection between them, each track having a first end and a second opposite end; a pair of movable platforms, one platform on each track, each platform being selectively connectable to both first and second ends by one or more elastic members, wherein each platform has a first attachment element and an opposing second attachment element extending downward from opposite ends of the platform in a spaced apart relation, each of the first and second attachment elements having a series of spaced openings therethrough, wherein the elastic members are mounted beneath each platform to and straight between the first and second spaced attachment elements through the openings, each elastic resistance member having one end connectable to the first attachment element through one of the openings and a second end connectable to the second element through another one of the openings when the resistance member is not in use; and each end of any one of the elastic resistance members is configured to be removably pulled further through the one of the first or second attachment elements in one direction and fastened to an end of the track closest to the platform element through which the end of the elastic member has been pulled, and wherein at least one other elastic member is configured to be removably passed through the other one of the first or second attachment elements in an opposite direction and fastened to the end of the frame closest to the other one of the first or second elements such that the platform can be neutrally positioned between the opposite ends of the tracks.