Physical exercise is a physical activity process that uses various sports means, combines natural forces (sunshine, air, water) and health care measures to develop the body, improve health, enhance physical fitness and entertain the body and mind. It is the main form of mass sports activities. It plays an important role in promoting human growth and development, cultivating bodybuilding posture, improving working ability, eliminating fatigue, regulating mood, preventing and treating diseases, prolonging life and even improving the physique of the whole nation. It is characterized by a wide crowd, and people of all ages, sexes, different occupations and health conditions can take appropriate exercise according to their personal conditions. Flexible in form and content, you can exercise alone or in groups. The content of sports is extremely rich, which can be divided into five categories: fitness, bodybuilding, entertainment, fighting, medical treatment and correction. There are many ways to exercise. In addition to the common exercise methods in teaching and training (including repetition, transformation, synthesis, circulation and competition), people have formed various eclectic fitness methods in long-term exercise practice (including morning exercises, interval exercises, production exercises, Cooper 12 minute test, etc.). ). The determination of exercise content and methods and the whole exercise process should follow the principles of physical exercise, that is, pertinence, adaptability, step by step, perseverance, appropriate load and emphasis on exercise value. In addition, if we can use China's traditional fitness methods at the same time, such as the combination of form and spirit, static and dynamic, and internal and external combination, the effect will be even greater. Benefits: Physiologically, 1. Physical exercise is conducive to the growth of human bones and muscles, enhancing cardiopulmonary function, improving the functional status of blood circulation system, respiratory system and digestive system, promoting human growth and development, improving disease resistance and enhancing the adaptability of the body. 2. Reduce the chances of children suffering from heart disease, hypertension, diabetes and other diseases in adulthood. 3. Physical exercise is one of the most active and effective means to enhance physical fitness. It can reduce your risk of premature aging. 5. Physical exercise can improve the regulation function of nervous system, improve the ability of nervous system to judge complex changes in human activities, and make coordinated, accurate and rapid responses in time; Make the human body adapt to the changes of the internal and external environment and maintain the normal life activities of the human body. Psychologically, 1. Physical exercise has the function of regulating human tension, improving physical and psychological state, and restoring physical strength and energy; 2. Physical exercise can improve physical health, make the tired body have a positive rest, and make people energetically engage in study and work; 3, stretching the body and mind, helping to sleep well and eliminating the pressure brought by reading. 4. Physical exercise can cultivate sentiment, maintain a healthy mentality, and give full play to individual enthusiasm, creativity and initiative, thus improving self-confidence and values and making personality develop healthily and harmoniously in a harmonious atmosphere; Team events and competitions in physical exercise can cultivate people's spirit of unity, cooperation and collectivism. Teenagers are an important turning point in people's life when their physical and mental development tends to mature. At this time, you will be surprised to find that there are many unprecedented changes in physical and psychological aspects, and you obviously feel that you have grown up. With the improvement of people's living standards and cultural quality, "everyone has a love of beauty", so we should thrive in sports and keep fit in sports.