The Cybex 625A Lower Body Arc Trainer is designed to concentrate on the lower body; the 625A cross trainer is popular with facilities that want to provide variety for their users. The versatility of the Cybex 625A Arc Trainer means that this machine can provide a diverse range of user needs and desires. Research shows that the Cybex 625A Lower Body Arc Trainer burns more calories than any other cross trainer or elliptical cross trainer tested. It engages the right muscles — quads and glutes — that demand lots of energy from the body when they are called upon to work. That means big calorie burn. And because the Arc Trainer is demanding on the muscles — not the joints, it can be used longer without putting a strain on the knees, hip or back.