US Patent 7998038 Exercise apparatus using weight and pneumatic resistances

An exercise apparatus is disclosed that comprises a frame, at least one user interface movably coupled to the frame, a pneumatic resistance device, and a weight stack coupled to the frame. The weight stack is arranged between and in series with the at least one user interface and pneumatic resistance device and is coupled to the at least one user interface by a first force transfer mechanism and to the pneumatic resistance device by a second force transfer mechanism.