A hunchback means that your back muscles are not strong enough. It is recommended to exercise more back muscles and erector spinae. Specific methods include anti-sit-ups (erector spinae), hard pull (erector spinae), rowing with barbell (dumbbell) (back muscle expansion), forehand pull-ups with wide hands (back muscle expansion), neck pull-down of instruments (upper back muscle and back muscle expansion), and rowing with instruments sitting posture (upper back muscle and back muscle expansion). In addition, the shoulder ligament strain is fine, similar to the action of chest expansion. Hands can be stretched backwards by their own strength or by external force. Be careful not to get hurt, bit by bit.