An exercise apparatus in this disclosure includes a doorway mountable runner restraint device. The device has a generally rigid, preferably padded, belly pad that is placed against and in front of a user's pelvis and abdominal area. A pair of cords are attached to the belly pad, each having an opposite...http://www.google.es/patents/US8088045?utm_source=gb-gplus-sharePatente US8088045 - Core stabilizing running exercise system and apparatus
Core stabilizing running exercise system and apparatus
