Some people say that elastic belt can improve hunchback. How to train?

Elastic belt can improve the problem of humpback, exercise rotator cuff muscles, stabilize scapula and prevent scapulohumeral periarthritis. Of course. Elastic belt sitting paddling. Keep your back straight, keep your legs straight forward, put your feet in the middle of elastic belt, keep your arms straight forward, and hold both ends of elastic belt with both hands. Keep your body stable, keep your back straight, and the muscles of your back exert force to drive your arms to bend your elbows and pull them towards your abdomen. Stop at the apex, contract the back muscles, and then slowly recover, so that the back muscles can be effectively stretched. You can also do elastic belt rowing in prone position, elastic belt rowing with one arm in prone position, and elastic belt lifting with straight arm on your back.