It is suggested that you can practice push-ups (chest) yourself first, and then practice swimming techniques with correct posture for swimming training, because swimming can exercise back muscles best; You can also buy dumbbells for supine birds at home. These are the most convenient and cheapest. You can go to the gym if it's expensive, and the coach will tell you everything. It is believed that all exercises related to chest muscles and back muscles can improve the phenomenon of humpback.