US Patent 9486668 Weight stack pushup exercise device

An exercise machine is provided for developing the chest muscles while maintaining correct biomechanical posture and joint movement for the user, thereby maximizing efficiency and safety. The exercise machine includes a track on which two platforms independently slide. The platforms are each interconnected to a weight stack unit or other vertical resistance unit that provide resistance to the inward movement of the platforms. Each platform may also be connected to a tension element or resistance band that is configured to provide gradual and progressively increased resistance as the platforms are moved inwardly towards the center or center stop of the track.