The muscles of the chest are tense, the muscles of the back are relaxed and elongated, and the muscle lines on both sides cross, forming the upper cross syndrome. The clinical manifestation is round shoulder, accompanied by head and neck tilting forward, and the thoracic vertebrae appearing posterior convex deformity. The causes of upper cross syndrome are: first, long-term poor posture leads to passive elongation of the back muscles and tension of the anterior muscles; second, excessive fitness, excessive strength of the chest muscles, such as pectoralis major and pectoralis minor, and little exercise of the back muscles, such as rhomboid and rhomboid muscles, resulting in insufficient strength of the back muscles. Treatment methods include the following two kinds: first, the tension muscles to loosen the stretch, massage, massage can loosen the muscle, reverse stretch muscle can make the muscle to restore compliance; second, enhance the back muscle strength, such as pull-ups and high pull-down, 4-6 sets per day, 12-16 times per set, can enhance the back muscle strength and intensity.