The human body is an organic whole composed of various organ systems. When doing exercise, it seems that only the muscles are moving. In fact, the respiratory and blood circulation organs of the body are all involved in the activities, and they must be commanded and coordinated by the cerebral cortex. Warm-up activities are only to improve the excitement of neurons in the cerebral cortex. Warm-up activities can also slightly raise body temperature, make muscles and tendons in good condition, have good elasticity and ductility, and will not be pulled or torn due to sudden contraction, which is particularly important in winter. Throwing, such as throwing grenades, shot put, solid ball, javelin, softball, etc. You must act according to the teacher's password. It is forbidden. There must be no carelessness.
Sports: sports in a narrow sense, commonly known as "small sports". It is an integral part of education and a purposeful, planned and organized educational process through physical activities and other auxiliary means. Sports itself is a complete system, which can be divided into general sports and professional sports. Its basic feature is outstanding education and teaching. Physical education takes teaching as the main way, classroom teaching or special counseling as the main form, and physical exercise and health care as the main means.