Simply put, many people's profiles are not very symmetrical. Many people have thick arms and thin breasts. You don't have to care about him. If you want to exercise your muscles, you won't feel anything. If it's just a simple question, you don't have to worry about it. It doesn't make sense for you to practice alone. This is a physiological problem, and it is more difficult to solve it by practicing alone. For example, I often see a big chest and a small chest (referring to men). It's useless to practice on one side, and the result is that you can practice all the time, no matter which side, both sides will look comfortable.