Patent ID: 8512210

Claim:
A limb-exercising system for attaching to an office swivel chair having a plurality of chair legs, each chair leg coupled by respective pivotal pin with a respective castor, said respective pivotal pin extending upwardly across a gap between the chair leg and the respective castor, the limb-exercising system comprising: a rigid platform for coupling with at least three of said pivotal pins substantially within said gap, said coupling substantially surrounding the said at least three pivotal pins, detached from said castors, such that the relative movement between said rigid platform and said office swivel chair is minimal; at least one interchangeable limb-exercising unit, coupled with said rigid platform, each said at least one interchangeable limb-exercising unit operative to provide movement exercise for at least one muscle group of the body of a user; a force resistor coupled with said rigid platform and with said at least one interchangeable limb-exercising unit, said force resistor providing resistance to movement of said at least one interchangeable limb-exercising unit; and a cable coupled between said at least one interchangeable limb-exercising unit and said force resistor.