1 First of all, we should pay attention to the comprehensiveness of physical exercise. The human body is a whole and needs comprehensive exercise to maintain the balance and coordination of physical development; 2. Teenagers should exercise moderately. It will not cause excessive fatigue and damage health because of too much exercise, and it can also prevent too little exercise from achieving the purpose of exercise; 3. Teenagers should pay attention to the difference of exercise. The arrangement of physical exercise items and exercise amount will have certain differences due to age, gender and individual, which will lead to excessive fatigue and damage health, avoid too little exercise and fail to achieve the purpose of exercise; 3. Teenagers should pay attention to the difference of exercise. The arrangement and amount of physical exercise will show certain differences due to age, gender and individual. In practice, specific arrangements should be made for different people; 4. Persistence of physical exercise. Physical exercise should be persistent, so as to keep the content, method and exercise load of exercise continuous. Dongshi