First, running is a whole-body exercise, which can make the muscles of the whole body contract and relax rhythmically, increase muscle fiber and increase protein content. Muscular development is one of the signs of bodybuilding. Second, bones are the scaffolding of the body and the lever of human activities. Teenagers in the growth and development period can improve blood circulation, increase nutrient supply to bone cells, improve the growth ability of bone cells, and thus promote the normal development of bones. The metabolism of the elderly is weakened, muscles are gradually atrophied, bones are degenerated, and bone and joint diseases are increasing. Persisting in running can strengthen metabolism, delay the degenerative changes of bones, prevent the occurrence of bone and joint diseases in the elderly, and thus delay your aging. Third, the heart is the general hub of blood supply to the whole body and the driving force of life. Long-term running will make your heart muscle stronger and increase the content of protein and myoglobin. Under the X-ray perspective, it can be clearly seen that the athlete's heart is bigger than the average person, with a plump appearance and a strong pulse. The average person's heart volume is 765-785 ml, while those who insist on exercise can reach1015-1027 ml, and the heartbeat is slower than that of normal people 10-20 beats/min, thus reducing the workload of the heart. On the other hand, running can enhance the endurance of the heart. As we all know, when the heartbeat exceeds 100 beats/minute, the average person will feel dizzy, flustered and asthmatic. Long-term runners can tolerate 150 times/minute. Fourth, people's life activities are inseparable from oxygen for a moment, inhaling fresh oxygen and exhaling carbon dioxide. Vital capacity and maximal ventilation are important indexes to measure the health of respiratory function. Running can develop respiratory muscles and increase vital capacity 1-2 liters. The maximum oxygen uptake of trained athletes is 33-60% higher than that of ordinary people. 5. Running can enhance gastrointestinal peristalsis, increase the secretion of digestive juice, improve digestion and absorption capacity, thus increasing appetite, supplementing nutrition and enhancing physical fitness. 6. For women, running helps to regulate menstruation and reduce gynecological diseases. An American obstetrician and gynecologist investigated the menstrual cycle of 394 female athletes in the 1979 New York Marathon. It was found that 26% of women with menstrual disorder recovered their normal cycle, and 17% of women with amenorrhea recovered their menstruation. This is because running increases metabolism, promotes digestion and absorption, regulates nervous system function and improves endocrine function. Seven, running can temper people's will and perseverance, enhance toughness and patience, improve sensitivity and promote adaptability to the environment. People who insist on exercising for a long time have three characteristics when completing quantitative work: first, they act quickly; Second, it has great potential and can exert its maximum functional potential to complete the task; Third, the recovery is fast, the fatigue is eliminated quickly and thoroughly, and it can quickly return to a calm level.