Follow the principle of gradual progress. The exercise mode should be from easy to difficult, the amount of exercise should be from small to large, and the exercise time should be from short to long. For example, when doing fitness running, you can start with a shorter distance and a slower speed. Through a period of exercise, you can run a longer distance and a faster speed, and then gradually increase after your body adapts.

We should follow the principle of comprehensive development. Sports should develop all parts, functions and qualities of the whole body, not just a certain part or quality, but also different types of sports content. To achieve: "Aerobic exercise every day, strength exercises every other day, flexible exercises are often accompanied."

Follow the principle of safety and effectiveness. Physical exercise must pay attention to safety. If you feel unwell, stop exercising, adhere to scientific exercise and exercise effectively.

Follow the principle of perseverance. Physical exercise can achieve the purpose of fitness, not once or twice, and it must be practiced for a long time to be effective.