An exercise apparatus may include a frame. A crank system may be coupled to the frame. A brake/inertia device may be coupled to the crank system. A pivotal linkage pendulum system may be coupled to the crank system. The pivotal linkage pendulum system may include one or more link members. An upper pivot...http://www.google.es/patents/US7708669?utm_source=gb-gplus-sharePatente US7708669 - Pendulum striding exercise apparatus
