According to the investigation in recent years, the physical quality of teenagers is declining year by year. Even some schools pass the physical examination less than 60%, and many students can't even run 1000 meters. In addition, the average height of men in China is only 1.69cm, ranking 32nd in the world, and starting to lag behind Asian countries such as Japan and South Korea. The root cause of these phenomena is the lack of physical exercise. Many people think that physical education class is irrelevant. Just running and jumping. That was not the case. The most fundamental purpose of physical education teaching is to train students' physical fitness and cultivate their enthusiasm and interest in sports. In general teaching, I found that many students have poor physical fitness and often catch a cold and have a fever, which is a typical manifestation of students' lack of exercise. Sports can greatly improve this situation. Proper physical exercise can strengthen students' physique, improve their immunity and make them better engaged in study and life.

Promote the study of other subjects.

"The body is the capital of the revolution." A healthy body is the foundation of learning. Nowadays, the pressure of schoolwork is increasing, and students have to finish their homework very late. In addition, due to the supervision of parents and teachers, the study pressure is increasing day by day. It is absolutely unbearable not to have a healthy and strong body to study and live intensively for a long time. Exercise is an excellent channel to release stress. Aerobic exercise in physical education class can greatly reduce physical and mental stress, make people temporarily out of the tense learning atmosphere, and is very helpful for learning. If you study under high pressure for a long time, your learning efficiency will be greatly reduced, and your grades will not rise, but will decline. Physical education class can fully relax the brain, reduce the usual study pressure, and greatly improve the study efficiency.

Restrain obesity

Obesity is one of the most puzzling problems in today's society. It will not only affect personal image, but also cause problems such as hyperlipidemia and hypertension. With the improvement of living standards, the popularity of foreign fast food and the appearance of obesity are often young people, especially teenagers. Now they are just children. Coupled with the improvement of living standards, parents have no restrictions on their children's diet, and their children's lives have become more and more comfortable. Then there is the problem of obesity. Adolescence, height and psychology are in a stage of rapid development. However, obesity will greatly hinder the growth of students. Studies have shown that obese children and adolescents accumulate too much fat, and their oxygen consumption is 30% ~ 40% higher than that of normal people. If their oxygen "can't make ends meet", they will be listless and easily tired, which will affect their learning efficiency and lead to a decline in their academic performance.

In addition, overweight will increase the burden on the body, and injuries to flat feet, knee flexion, lower limb flexion, spine and intervertebral cartilage occur from time to time. Obese children have high cholesterol and fatty acids, high blood lipids, suppressed immune system and weak disease resistance, and are prone to respiratory diseases, but they are also prone to some "adult diseases", such as diabetes, hypertension and fatty liver. Setting up physical education class can help students get proper exercise in class, consume excess body fat and cultivate their interest in sports.

In this way, the obesity problem of students can be controlled to a great extent, which is also of great help to their physical and mental development. Students' study is very important, but healthy body is more important than academic performance. Without a healthy body, no knowledge can be used. In school, the setting of physical education class is very important. Correct and systematic physical education is a powerful guarantee for students' healthy growth. As school PE teachers, we have the responsibility and obligation to help students build a strong body. There are still many shortcomings in physical education in China, and the continuous efforts of physical education teachers are needed.