The term door gym bar is a strength training exercise. People frequently do this exercise with the intention of strengthening muscles and biceps.Both pull-ups and chin-ups are two of the bestexercises for back and overall upper body conditioning. However, they target the muscles a bit differently. They are used simply for climbing and for coordination skills. They are also used by more advanced gymnasts for resistance training, flexibility training or abdominal exercises. Gymnasts can hang from a higher bar with their back facing the bar and perform abdominal exercises, or hang facing the bar to stretch their back. Wall bars are also useful for parkour training. They provide several different heights to jump to and provide an area to jump off from.