1. Exercise can stimulate the central nervous system and endocrine system. Exercise can promote the blood circulation of the whole body, enhance the metabolism of cells and tissues, contribute to the supply of oxygen and nutrients in various systems of the body, and enhance the functions of various organs of the human body; It can also delay the decline of the body's ability, delay the decline of the structure and function of human tissues and organs, and make people full of vitality. 2. Exercise can reduce body fat accumulation and lose weight. Exercise needs energy, and energy mainly comes from fat, so exercise can lose weight, thus reducing the burden on the heart, strengthening the body and achieving the function of bodybuilding. 3. Exercise can regulate mood and make people feel happy. Theory and practice have proved that regular activities in the natural environment can adjust people's emotions and make people feel happy and refreshed. At the same time, participating in various sports can cultivate a cheerful and peaceful attitude and help to establish good interpersonal relationships. 4. Exercise can enhance cardiovascular function. Regular exercise can enhance the contractility of the heart, increase the cardiac output and cardiac index, slow down the heart rate and enhance the reserve function of the heart. Physical exercise can also reduce total cholesterol and low-density lipoprotein in blood and increase high-density lipoprotein, thus preventing the occurrence of atherosclerosis. 5. Exercise can improve the function of nervous system. Fitness exercise has an obvious effect on delaying the aging of nervous system, which is mainly manifested in the obvious enhancement of memory, the obvious improvement of the body's responsiveness to external stimuli, and the improvement of attention and analytical comprehensive ability to varying degrees. 6. Exercise can enhance the function of respiratory system. The influence of exercise on respiratory function is mainly manifested in increasing vital capacity, enhancing gas exchange between lung and tissue, and improving oxygen uptake and utilization rate of tissue cells. 7. Exercise can continuously improve the function of digestive system and promote metabolism. Middle-aged and elderly people can increase their appetite, promote the secretion of digestive enzymes, improve gastrointestinal motility and improve the absorption and utilization of foreign nutrients through physical exercise. At the same time, physical exercise can also accelerate the utilization of heat energy in the body, prevent and reduce the accumulation of fat in the body, and keep the metabolism of sugar, fat, protein and free radicals in a stable and balanced state. 8. Exercise can improve the immune function of the body. Studies have proved that exercise can improve the transformation ability of lymphocytes, stimulate B cells to secrete specific antibodies, and enhance the cellular immunity and humoral immunity of the body. Exercise can also improve the phagocytic function of macrophages and help to eliminate free radicals in the body. 9. Exercise can promote the development of brain and intelligence and improve memory. People's intellectual activities mainly depend on the movement of the brain, which accounts for a quarter of blood supply and a fifth of oxygen consumption. Exercise increases the blood flow through the brain, which not only delays the aging of brain cells, but also improves the reaction speed of nerves. Science has proved that exercise can promote the development of the brain, make the brain release a special chemical substance, make people feel happy, and play a very good role in developing intelligence and improving memory.