In childhood and adolescence, in addition to the required nutrition, it must be balanced (including water, protein, inorganic salts, vitamins, fat and sugar), and attention should be paid to supplementing protein and calcium, which are helpful for the development and growth of bones. Then, when you exercise, you need to pay attention to adequate nutrition intake, not too full, but you can't exercise on an empty stomach. After exercise, you can regularly add some inorganic salts, water and protein.