Physical examination, commonly known as physical examination. Jay Hyman, a famous American women's volleyball player, died of "Malfoy's disease", which means that she lacks strict examination and understanding of her health. Before scientific exercise is carried out for primary school students, every student should undergo a strict physical examination to see if there are any physical disabilities, diseases and other conditions that are not suitable for physical exercise. In order to make a reasonable exercise plan, the content, means and amount of exercise are arranged according to health and physique. This can not only improve the exercise effect, but also avoid accidents. The comprehensive exercise of human body is a complete unity, and its various parts, organs and systems have relative functions, but they are interrelated and influence each other. Only comprehensive exercise can promote the overall development of the whole body. Otherwise, it will cause unbalanced and uncoordinated physical development. This is especially important for children in the developmental stage. Research shows that different sports content causes different physiological changes and adaptations of human body. For example, running exercises can improve students' vital capacity, and parallel bars exercises can enhance the strength of hands and arms. Comprehensive exercise can make these benign adaptations complement each other and promote each other, so that physical fitness and sports ability can be comprehensively developed and improved. Therefore, comprehensive exercise is an important principle. The stimulation of physical exercise by human body promotes the change of function step by step, which is a process of gradual adaptation, development and improvement after repeated times. In other words, through physical exercise, the process of developing physical fitness and enhancing the basic activity ability of physical fitness is an orderly and gradual exercise effect, which cannot be achieved overnight. As the saying goes, "you can't get fat in one bite." Therefore, the physical exercise of primary school students must be gradual. Otherwise, not only can you not get the exercise effect of improving your sports ability, but it will be harmful to your body and even cause physical injury. An important principle of differential treatment in modern education is to teach students in accordance with their aptitude, and primary school students should also be treated differently in physical exercise. Facts have proved that even groups of the same age will have differences in gender, physique, physical foundation and heredity. Therefore, to carry out physical exercise, we must treat it differently in the content, method and quantity according to the students' reality, otherwise some people will "not have enough to eat" and others will "not have enough to eat". For example, to do long-distance running exercise, boys and girls can't practice 800M long-distance running, and they should be treated differently according to gender and personal physique. 5. Regular exercise From a biological point of view, the development of human body and the enhancement of physical fitness are a long process of constant adaptation, accumulation and gradual improvement. It can't be "immediate" and it can't be done once and for all. According to the principle of "use in the middle, abandon in the middle", the law of human body's adaptation to physical exercise is: regular exercise will make progress and development, and failure to persist in exercise will weaken. Therefore, the physical exercise of primary school students should be persistent, not "fishing for three days and drying the net for two days", otherwise the original effect of exercise will fade. Six reasonable load In the concept of exercise, load is the amount of exercise. If primary school students want to achieve the ideal effect of physical exercise, they must have a proper amount of exercise. The amount of exercise is the sum of the amount of exercise. If a sports activity is not properly arranged, it cannot be called a qualified sports activity. The amount of exercise consists of factors such as exercise intensity, density and duration. For healthy children, when the heart rate reaches 180- 190 times per minute during exercise, the oxygen consumption is close to 90- 100% of the maximum oxygen uptake, which belongs to severe exercise; When the heart rate reaches 150- 170 beats per minute, the oxygen consumption is 70-80. The standard of primary school students' exercise should basically be kept above moderate and moderate exercise. The transition of seven warm-up activities from a relatively quiet state to a state of exercise requires a process of overcoming physiological inertia, that is, warm-up activities. The inertia of different parts of the human body is different, among which the muscle inertia is the smallest. It takes about 10-20 minutes for pupils to get rid of their physiological inertia. Its function is to improve the excitability of nerve center, strengthen cardiopulmonary function, and make muscles, tendons and ligaments in a good state of elasticity and extension. It is an effective measure for primary school students to protect themselves, especially in the season of low temperature and cold climate, and more attention should be paid to preparatory activities. Eight finishing activities The gradual transition of the human body from strenuous activity to a relatively quiet state also requires a transition process, which is usually called finishing exercise. Its function is to relax tense exercise and increase oxygen intake through relatively relaxing and soothing physical activities, thus accelerating the relief and elimination of fatigue. For example, this is the purpose of arranging exercises for primary school students to broadcast gymnastics. A qualified student must develop morally, intellectually and physically. Scientific principles and methods of physical exercise are the reflection and way to guide the basic laws of physical exercise for primary school students, and are the basic requirements for arranging the content and following of physical exercise for primary school students. Only by paying attention to the application of scientific exercise principles and methods to guide primary school students' exercise practice can we achieve ideal results, get twice the result with half the effort, and train builders and successors in the 2 1 century.