First, fitness can improve the function of respiratory system and cardiovascular system. Scientific practice has proved that long-term rhythmic deep breathing can make people inhale a lot of oxygen. If the oxygen intake exceeds 7-8 times of usual, it can inhibit the growth and reproduction of human cancer cells. Secondly, long-distance running also improves the oxygen supply state of myocardium, accelerates myocardial metabolism, thickens myocardial fibers and enhances myocardial contractility, thus improving the working ability of the heart.

Second, fitness is conducive to strengthening physical fitness and preventing diseases. Physical exercise accelerates blood circulation and cleans up harmful substances in the excretory system, thus making it difficult for harmful substances to stay and spread in the body.

Third, fitness is conducive to a happy mood and a happy spirit.

Fourth, it is conducive to cultivating the tenacious will to overcome difficulties and temper hard struggle.

Fifth, improve memory. A recent study by Georgia Institute of Technology shows that memory can be improved by 10% only by exercising for 20 minutes every day.