These sports include jogging or middle-speed running, race walking, various ball games, gymnastics, track and field, swimming and so on. These exercises can accelerate blood circulation, improve the nutrition of digestive organs and glands, and enhance the digestive and secretory functions of these organs.
In addition, due to the strengthening of respiratory movement, the diaphragm moves up and down, and the stretching force of abdominal muscles is equal to the external force to massage the gastrointestinal tract. Therefore, after long-distance running in winter and swimming in summer, teenagers' appetite is obviously increased, their digestive ability of gastrointestinal tract is improved, and their body's resistance to various diseases is also enhanced.
The second is muscle strength exercises, such as push-ups, pull-ups and dumbbell exercises. , can exercise the muscles of upper limbs and chest; Sit-ups, sit-ups and leg lifts, push-ups, etc. Can exercise abdominal and back muscles; In-situ vertical jump, squatting, in-situ straight leg jump, in-situ high leg lift jump, leg swing, kicking back and forth, etc. , can exercise the muscles of the lower limbs. Children living in cities can also exercise their leg strength by grasping stairs, running stairs and jumping stairs. Thin children should be careful not to overdo it when exercising because of their weak muscle fibers, which will cause excessive fatigue, muscle aches, sports injuries and loss of appetite.