It latches on without screws, bolts or fasteners, so you won’t leave holes in your door trim. A cantilever design uses your own body weight (up to 300 lbs.) to keep it in place. Door Gym is more than a simple pull-up, chin-up bar. It also has two protruding close-grip handles that let you work out with your palms facing each other, a good position for isolating the muscles in the center of your back that control posture. In addition, you can use Door Gym on the ground as a push-up bar and a sit-up spotter.