1. 1 The advanced concept of primary school physical education promotes the healthy development of teenagers' physique.

Changing the traditional concept of physical education and effectively implementing quality education from the perspective of cultivating students' all-round physical and mental development are the main requirements put forward by the current educational reform and the main principles followed by physical education in primary schools for a long time to come. In the era of knowledge economy, paying too much attention to intellectual education and neglecting physical and mental health will be counterproductive. The two should complement each other and be indispensable. With the gradual deepening of our country's emphasis on education, it has become the main task of primary school physical education to change the educational concept and improve the comprehensive quality of teenagers. All kinds of primary schools have changed the traditional physical education ideas and accepted the advanced education ideas that adapt to China's education system, laying a foundation for promoting the physical health of teenagers. Although China's traditional examination-oriented education still deeply affects the current primary school physical education, under the impetus of the reform thought, China's primary school physical education will definitely change its thinking, continuously develop and improve students' physical and mental health education, and lay the foundation for cultivating talents with high physical health level in 2 1 century. Healthy body and mind is an important carrier of knowledge and ability, and the introduction of advanced educational ideas into primary school physical education just provides a good educational environment for students and promotes the healthy development of teenagers' physique.

1.2 diversified physical education teaching methods in primary schools promote the healthy development of teenagers' physique

The transformation of primary school physical education teaching mode is the focus of primary school physical education work at present. Under the requirements of the new curriculum reform, primary school physical education can make students play more subjective initiative under the guidance of teachers, and at the same time require teachers to adopt diversified physical education teaching methods to promote the healthy development of teenagers' physique. Physical education teaching in primary schools should emphasize the guidance of students' physical exercise methods, pay attention to the improvement of students' autonomous learning ability and enhance students' initiative to participate in physical exercise. Diversified physical education in primary schools requires teachers and students to live in harmony, create a harmonious and happy sports atmosphere for students, ensure students to enjoy sports in sports, and at the same time have a favorable impact on the healthy development of students' physique. The new round of physical education curriculum reform in primary and secondary schools keeps the teaching of basic physical education knowledge and skills in physical education class, and increases the teaching content of physical health knowledge, requiring teenagers to master more physical health knowledge and scientific fitness methods in physical education class to promote their health. In addition, using some related games in primary school physical education to cultivate students' interest in a certain physical fitness can not only attract teenagers to actively participate in physical education, but also help teenagers to develop physical fitness habits and lay an ideological foundation for their long-term health.

1.3 Actively carry out extracurricular sports activities to promote the healthy development of teenagers' physique.

If you really want to improve the health of teenagers, it is not feasible to rely on physical education class twice a week. Physical education class is more about imparting sports-related skills to students, which can increase students' awareness of physical exercise to a certain extent, but it may not make them persist for a long time. However, the healthy development of teenagers' physique requires them to cultivate on the basis of long-term persistence. Therefore, attaching importance to extracurricular sports activities and making them an important part of physical education in primary schools will certainly play an important role in the healthy development of teenagers' physique. In view of the shortcomings in the monitoring of students' physical health in recent years, the Ministry of Education began to increase the content of extracurricular sports activities in the reform of physical education in primary schools, and strived to ensure that teenagers could adhere to 1 hour of sports activities every day. Specifically, there are several ways to carry out extracurricular activities in primary school physical education class: First, add some game sports to students' extracurricular activities to ease the learning pressure of teenagers and make them realize the important role of sports in regulating their emotions; Second, campus sports meetings are held regularly, and students of different grades set up competitions according to different standards. The competition focuses on cultivating students' interest in sports, letting them understand the spirit of sports, and letting teenagers increase the number and time of physical exercise on the basis of a correct understanding of sports, thus promoting the healthy development of their bodies.

1.4 innovate the evaluation standard of physical education teaching in primary schools to promote the healthy development of teenagers' physique.

The evaluation standard of teenagers' physical health is a quantitative measure of teenagers' physical health. Whether the evaluation index is reasonable will directly affect the future development of school physical education, and will also have an impact on students' physical health. Relevant surveys show that there are still many imperfections in the physical health standards of primary school students in China, such as 50m running and standing long jump. Most primary schools in physical education class only measure and assess students' physical quality standards from the speed and distance, but lack the assessment indicators of their sensitive coordination and other physical abilities. However, teenagers are in a critical period of cultivating sensitive and coordinated quality. If there is no corresponding evaluation index, it is bound to neglect the cultivation of teenagers' quality in education, which is very unfavorable to the future development of students' sports skills and physical health. Therefore, primary school physical education is also gradually innovating teaching evaluation standards, improving the tendency and operability of primary school physical education teaching indicators, thus promoting the healthy development of teenagers' physique.

1.5 Reasonably plan the content of physical education in primary schools to promote the healthy development of teenagers' physique.

The investigation shows that the main reason for the low physical function and physical quality of teenagers is that school physical education is relatively backward and does not meet the requirements of the healthy development of teenagers' physique. Therefore, school physical education should combine the physical health of teenagers, choose the content of physical education, understand the sports that students are interested in through questionnaire survey or direct observation and inquiry, and meet the requirements of students' learning desire and healthy development for physical education as much as possible. In addition, primary school physical education should also attach importance to antagonistic sports, and this part of the teaching content should not be carried out because of the strong antagonistic characteristics of these sports, such as outdoor expansion sports. In the curriculum, we should avoid the singleness of traditional physical education class, pay attention to the combination of physical education class and campus culture, scientifically and reasonably plan the content of physical education class in primary schools, provide students with certain autonomy and selectivity, and let them choose their favorite sports according to their hobbies. At the same time, teachers should provide students with sports skills guidance and record the sports that different students often choose in physical education class. Through many times of summary and analysis, the content of primary school physical education suitable for the healthy development of teenagers is formulated to find out the problems existing in the physical health of teenagers and promote the healthy development of teenagers.

1.6 Optimize physical education teaching methods in primary schools to promote the healthy development of teenagers' physique.

First of all, insist on the formation of students' interests as the target point, the structure of the curriculum as the logical starting point, and the curriculum evaluation as the basic starting point to carry out primary school physical education teaching. Curriculum is an important factor to ensure the formation of teenagers' physical health and the most basic condition for the development of primary school physical education. Therefore, optimizing the evaluation method of primary school physical education is conducive to promoting the healthy development of teenagers' physique, and it is also one of the important ways to promote the healthy development of teenagers' physique. Secondly, it is beneficial to promote the healthy development of teenagers' physique to carry out physical education in primary schools with teaching mode as a practical innovation point. With the deepening of sports theory research, the traditional boring education methods need to be changed, and various schools have also carried out sports teaching reform. New teaching modes, such as emotion and paradigm, began to appear in different primary school physical education courses, which provided new ideas and outlets for primary school physical education teaching in the new period. The scientific and reasonable teaching mode is used to arrange the course content, and the teaching content and class hours are formulated according to the actual situation of different students, which provides a basis for teachers' teaching, so that teenagers can have fun in sports and enjoy the fun brought by sports, and gradually form regular physical exercise habits under the encouragement of this fun, and promote the healthy development of teenagers' physique. Finally, primary school physical education promotes the healthy development of teenagers' physique by establishing a scientific analytical framework. The formation of teenagers' healthy physique is a process, in which we can achieve the goal of good health by strengthening practical experience. However, this process is relatively complicated. Primary school physical education monitors and supervises this process by establishing a scientific analysis framework, and improves the shortcomings in the whole process in time. Carrying out physical education in primary schools on the basis of this scientific analysis framework makes the goal of physical education in primary schools more clear and is more conducive to promoting the healthy development of teenagers' physique.

2 conclusion

The healthy development of teenagers' physique is closely related to physical education in primary schools. Many factors, such as teaching mode, teaching method, teaching content and teaching evaluation, all affect the healthy development of teenagers' physique and play different roles in it. In the process of promoting students' physical health, we must take school physical education as the leading factor and improve the physical health level of teenagers by improving teaching methods and teaching contents. From the perspective of promoting the healthy development of teenagers' physique, school physical education should establish the concept of life education, strengthen students' lifelong physical education, make primary school physical education the main way to promote the healthy development of teenagers' physique, and encourage teenagers to actively participate in primary school physical education and extracurricular physical exercise, so as to effectively improve their physical health.