If you want to practice the shoulder deltoid, you can do pull-ups First, hold the horizontal bar with both hands slightly wider than the shoulders, straighten your arms vertically, tighten your hips, keep your back straight with your body, hold your chest out, pull your body up until your collarbone reaches the horizontal bar for one second, and then slowly put it down. Pull-ups can not only develop super deltoid muscles, but also perfect chest muscles, which requires long-term exercise.