The fastest growing adolescents are speed, strength and endurance. The rapid pace of development quality, and this muscle, nervous system development are closely related, 100 Meters track record show that men aged 16 -17 years of age to reach adult levels, 18-year-old can reach a peak speed quality must improve in this age. Therefore, students aged between 10 and 17 should choose sprints, relay races and other training speed quality sports. Strength is related to muscle development and it is governed by the nervous system. The highest level of strength generally starts with the full development of the muscular system in the late youth. Therefore, excessive weight training should not be done. During youth development, young people should not choose weight lifting and other items, but should gradually perform their own strength and light load exercises, such as: throwing Javelin, grenades, high jump, long jump, etc. The ability of the body to recover quickly after a long period of continuous work or activity (such as a marathon) is called "endurance." The quality of endurance is related to the health of the body's physical and mental blood vessels, breathing, and nervous system. The age at which these systems are well developed is beyond the age of 20. Therefore, young people under the age of 17 should not choose long-distance running, cross-country races, and marathons. Sports programs must be based on age and physical characteristics and cannot be arbitrarily chosen based on interests and imagination. Only by adhering to long-term adherence can physical exercise develop in an orderly manner and develop in an all-round way. Swimming is an ideal project. Not only can the whole body get exercise, but it is also one of the sports items that will exercise willpower and perseverance. If we insist on participating in swimming exercises for 29 years to 30 years old, when the heart is shaped, the capacity of the heart chamber has increased, and there will be few changes in the later age stage, laying a solid foundation for a lifetime of health. Grass,Grass Seed,Lawn Care,Sod Grass Hangzhou LvDong Building Materials Co., Ltd , https://www.ldunite.com