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 brakets that are firmly fixed to the inside of a solid door frame. The Doorway Chin-Up Pull-Up GYM Bar is not only perfect for chin-up exercises but it can also be used as a foot anchor for sit-ups and crunches. Note: 1.SImple Assembly is required. 2.Please consider the weight capacity before using. 3.the bar can be fixed between the door frame either with or without screws into the wall.