Pull-ups on the horizontal bar mainly exercise the shoulder muscles of latissimus dorsi and trapezius muscles, and have effects on the muscles of chest, deltoid, biceps, triceps and forearm, especially latissimus dorsi and trapezius muscles, as well as shaping the body. The exercise method on the parallel bars is mainly the flexion and extension of the parallel bars arm, which mainly exercises the triceps brachii, the middle and rear part of deltoid muscle and the upper part of latissimus dorsi, and also has effects on biceps brachii, pectoral muscles and forearm muscles.