Great for super exercises that are proven to workout your body‎!‎ This unit can be used as a sit up bar or a chin up bar depending on your configuration‎.‎ Works on the basis of placing the bar between two brackets that are firmly fixed to the inside of a solid door frame‎.‎ The Doorway Gym Bar is not only perfect for chin‎‐up exercises but it can also be used as an upper body stretch‎,‎ Spine arch stretch‎,‎ hip & knee stretch‎,‎ full body stretch & Sit up & body stretch‎.‎