An exercise machine is described which is entirely self-contained without any source of outside power. A rechargeable battery is used to maintain the exercise system operative for a time-out period. At all other times the machine is powered by the user. The machine is compact, light, rigid and sized...http://www.google.es/patents/US6511402?utm_source=gb-gplus-sharePatente US6511402 - Power controlled exercising machine and method for controlling the same
Power controlled exercising machine and method for controlling the same
