The Body Solid Mountless Pull Up / Push Up Bar is great for chin ups, push ups and sit ups. Just place the top bar above your trim on the inside of your doorway and begin pull-ups. You can do push-ups simply by placing bar on floor, or do sit-ups by placing bar on floor inside doorway. A cantilever design uses your own body weight to keep it in place. 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. This bar fits doorways 24" to 32" wide and supports up to 300lbs. Pull-up Bar is secured by downward force, an upward force may cause bar to dislodge. The doorway trim should be secure and at least 2" wide.