The chest muscles are getting thicker and thicker. The depression of funnel chest is inward and backward, that is, the sternum in the middle of the person presses backward against the spine. Therefore, patients with pectus excavatum can exercise their chest muscles, do push-ups and do dumbbell birds, which will make their chest muscles thicker and thicker. Exercising chest muscles is to pull up the muscles on both sides of the sternum. The attachment point of pectoralis major muscle is actually the humeral tubercle that pulls up from the rib to both sides of the hand. The real strength of this pull-up is to pull the strength of a part of the ribs or sternum to both sides, and there is no way to pull it forward. Forward strength is the direction that really needs strength when correcting pectus excavatum.