A calf exercising machine which utilizes a frame-journaled rotating foot-engaging assembly, which rotates about an axis which is approximately common with the axes of rotation of the operator's ankle joints, to apply resistive force to the balls of an operator's feet through circular paths about the...http://www.google.com/patents/US4822038?utm_source=gb-gplus-sharePatent US4822038 - Calf isolating exercise machine
