US Patent 7108643 Push-up device

An elongate floor-supported platform having sliding handgrips mounted thereon. In a preferred embodiment, the handgrips, which are constrained to move only along a track, which may be linear or curvilinear and lying in a substantially horizontal plane, are interconnected by linking means such as belts. The linkage is such that the handgrips remain equidistant from a fixed centerline midway between the handgrips throughout their range of motion. In the preferred embodiment, the linking means are belts that are supported by pulleys housed within the floor-supported platform. In yet a further embodiment, the platform includes wall and/or ceiling attachment means and can be employed for performing pull-ups.