Patent ID: 7955229

Claim:
A portable exercise apparatus comprising: a) a user portable support frame having a front end, a rear end, and a longitudinal axis, the support frame comprising a plurality of interconnected longitudinally extending rails each rail having a vertical side surface and a horizontal top surface; b) a carriage assembly movably engaged with the support frame wherein: the carriage assembly engages the horizontal top surface of the rails for oscillating travel along the longitudinal axis of the support frame; a contact plate mounted to the carriage assembly and operatively configured to be engaged by a user; c) the carriage assembly having a front end and a rear end the carriage assembly further comprising; a carriage body; a plurality of wheels coupled to the carriage assembly, the wheels in contact with, and supported by the horizontal top surface of the rails; a tensioning system arranged for operative engagement between the carriage assembly and the support frame; a plurality of side plates coupled to the carriage housing and engaging at least one vertical side of each rail to maintain the carriage assembly upon the support frame in the transverse and vertical directions; d) the tensioning system comprising: a plurality of selectively operable elastic tension cords; a cord anchor member located on the carriage assembly; a selectively engaged cord connecting member mounted on the support frame to selectively connect the operating ends of the cords to the support frame; and a forward cord indexing member located on the carriage assembly.