Eight-character beauty back has an effect. According to relevant data, the eight-character is mainly used to exercise the shoulders and back, which has a good effect of opening the shoulders and beautifying the back, easily losing the flesh of the arm, effectively improving the hunchback and moving the neck. The figure-of-eight beauty back uses a figure-of-eight stretcher, which is a kind of equipment suitable for mass fitness exercise. The advantage of using a stretcher is that biceps brachii is a muscle with two muscle heads, and its main function is to bend the arm. Another muscle, the triceps brachii, is also used when bending the arm.