Patent ID: 8708873

Claim:
An apparatus comprising: an anchor securable to a first location substantially fixed with respect to the earth; a load assembly operably connected to the anchor, the load assembly comprising a resistance member connecting to the anchor and having an anchor end and a pulley end; a pulley assembly, including a pulley, connected to the resistance member, and a tether having first and second ends and extending around the pulley, positioned between the first and second ends; handles, comprising first and second handles, separate and distinct from one another and secured to the first and second ends, respectively; the load assembly, wherein the resistance member further comprises at least one elongation member, arbitrarily selectable by a user from a plurality of elongation members, each formed of an elastomeric polymer, sized in length to characterize a pre-selected range of motion of the user, sized in cross-sectional area to provide a pre-selected spring coefficient characterizing a relationship between force and elongation thereof, and connected proximate the anchor end thereof to the anchor and proximate the pulley end thereof to the pulley, a limiter comprising a stranded material having a substantially fixed length and effective to limit extension of the at least one elongation member in accordance with the fixed length, a first adapter, extending within the at least one elongation member to connect the at least one elongation member and the limiter to the pulley assembly; a second adapter, extending within the at least one elongation member, and connecting the at least one elongation member and the limiter to the anchor; the limiter formed into a closed loop linked to the anchor to restrain the at least one elongation member from moving away from the anchor in the event of a failure of the load assembly; the elongation member comprises a tube; and the first adapter and the second adapter each having a shank portion having a groove extending longitudinally therein, the groove being sized to maintain a circular cross section in the tube by receiving the limiter therein.