The supine pull-up is generally performed on a Smith machine. This exercise is a modified version of the classic pull-up. It is sometimes referred to as an inverted pull-up. The first step in this exercise is to adjust the bar height. The bar height should be approximately 4 feet high. You can adjust the bar height as needed. Next, ensure your handgrip is slightly wider than shoulder width apart. For this exercise, use an overhand grip. With your arms fully extended, pull yourself (neck/chest area) up to the bar, then return to the starting position.