Physical exercise refers to the use of various physical exercises and methods, combined with natural forces and health factors, to develop the body, improve health, enhance physical fitness, regulate the spirit and enrich cultural life. Science and practice have proved that many factors are involved in improving health and physical fitness, and physical exercise is the most active and effective method. Physical exercise is characterized by taking fitness as the main purpose, and the goal is to obtain the actual fitness effect. The form, content, methods and means of physical exercise follow the principle of being different from time to time, from place to place and from person to person, not sticking to one pattern, but according to everyone's specific situation, in accordance with the principles and methods of scientific physical exercise, combined with natural conditions. (1) The principle of self-awareness and enthusiasm Physical exercise promotes physical development. The enhancement of physical fitness is a process of long-term accumulation and hard struggle. In exercise, the human body must overcome its inertia and force itself to suffer. Good exercise effect cannot be achieved overnight, but it is not a long-term effort. To improve the consciousness and enthusiasm of physical exercise, we must: 1, understand the function, value and knowledge of scientific exercise of physical exercise, and improve our understanding of physical education; 2. Make clear the purpose of exercise, combine individual needs with national physique, population quality and national prosperity, and better stimulate their enthusiasm for exercise; 3. Strengthen the detection and evaluation of your exercise effect, so as to have more fun. (II) Principle of Differentiating from person to person Each exerciser should reasonably select and determine the content, method, exercise load and intensity of exercise according to his own situation, such as age, gender, occupation, health status, physical fitness level and living conditions. Even the same person, from teenagers to the elderly, has different interests, hobbies, ability to bear sports load and requirements for sports. (3) The principle of step by step and persistence The adaptation of human body to changes in internal and external environment is a slow process from quantity to quality. Physical exercise must gradually adapt to higher requirements according to the law of natural development of human body and the principle of excessive recovery, and gradually achieve the purpose of strengthening physical fitness. When choosing the content and method of exercise, we should change from easy to difficult, from simple to complex, and the weekly exercise times, exercise time, exercise load and intensity should be gradually increased, so we can't rush headlong into it. Determine the next exercise plan according to your own self-feeling, test effect and sports performance. Scientific exercise should not only be gradual, but also persistent. Strengthening people's physique is a process of continuous accumulation and gradual improvement. It is impossible to achieve results in a short time, nor can it be done once and for all. Always insist on it in order to get a good exercise effect. Three days of fishing and two days of drying nets, "one exposure to ten cold" is impossible to enhance physical fitness. We should take exercise as an indispensable part of our daily life and persevere. (4) The principle of appropriate exercise load refers to the physiological burden that physical exercise bears on the human body. Exercise load is determined by two aspects: exercise intensity and exercise amount. Exercise intensity refers to the strength and body tension used to complete the exercise, including the speed of the action, the density of the exercise, the length of the interval of the exercise, the weight of the load, the distance of throwing, the height and distance of jumping, etc. The amount of exercise refers to the number of times, frequency, number of groups, time, distance and weight of completing the action. Too little exercise can't achieve the purpose of exercise, and too much exercise will damage your health. The simplest way to measure exercise load is to measure pulse (heart rate). The commonly used methods are: 1, and the average heart rate during exercise is 120- 140 beats/min; 2. Take 220 years old and multiply it by 60%, 70% and 80% in stages as the appropriate heart rate, and then adjust it according to the self-feeling during and after exercise; 3. A person's heart rate close to the limit (if it is 200 beats per minute) minus 70% resting heart rate (if it is 60 beats per minute) plus 60 resting times is the appropriate exercise load (that is, the maximum oxygen uptake and cardiac output can be obtained). Namely: (200-60) × 70%+60 = 98+60 =158 (times/minute).

The characteristics of college students' physical health care are energetic, full of ideals, positive, quick to accept new things, rich in emotions and willing to communicate with others. However, the survey results in recent years are not optimistic. A survey of Chinese college students conducted by Beijing College Students' Psychological Quality Education Group in 2004 showed that 28.75% of the students had mental health problems such as obsessive-compulsive disorder, depression and anxiety, and 16.5% of the college students had moderate mental health problems, among which female students had higher mental health problems than male students, and the proportion of female students with problems was higher than that of male students 17.34%, among which junior students had mental health problems. The mental health problems in the second grade are the most prominent, accounting for 17.56%. The mental health problems of rural students are higher than those of urban students, and the proportion of rural students in remote areas is the highest, accounting for 19%. [1] "Depression" has become a word on the lips of many college students, and mental illness has quietly invaded the pure land of campus. Further investigation of these students shows that their psychological quality has obvious weaknesses, such as weak anti-frustration ability, willpower, crisis awareness and cooperation spirit, serious anxiety and nervousness, fear of academic failure, bad interpersonal relationship or being criticized by teachers and laughed at by classmates. College students are in a contradictory period of semi-dependence, semi-independence, semi-maturity and semi-naivety, and many of them have psychological conflicts, distress or self-concealment. Or ignored. As a result, many students are difficult to understand and feel isolated and helpless, so they have to hide in their hearts and let them torture themselves, thus inducing psychological problems. The Positive Influence of Physical Exercise on Mental Health Comrade Mao Zedong has many incisive expositions on the relationship between physical exercise and mental health, such as "Being diligent in physical exercise can strengthen bones and muscles, increase knowledge and adjust emotions, which means that physical exercise is closely related to mental health and can exert a positive influence. Scientific physical exercise can promote the development of students' physical quality and provide a solid material foundation for students' mental health. In ancient China, there were also many discussions in this respect. Lu's "Spring and Autumn Annals" describes that "running water does not rot, the pivot does not linger, and it is also dynamic and shapely. "This shows that physical exercise is beneficial to physical and mental health, and physical and mental health is interdependent. Scientific physical exercise can enhance physical fitness and provide a solid material foundation for the development of mental health. Physical exercise can make students know more about what they are good at, make an appropriate and objective evaluation of their abilities, personalities and advantages, and can develop their potential without putting forward harsh and unreasonable delusions. Experience the value of one's own existence and correct self-cognition. Physical exercise is the best way to enhance people's contact. In physical exercise, we can find like-minded intimate friends, cultivate students' communication skills and improve interpersonal relationships. Physical exercise can be communicated through gestures, expressions and body movements. In the direct or indirect contact and communication with activities, students will unconsciously feel close and gain a high sense of security and self-confidence. Therefore, physical exercise helps to coordinate interpersonal relationships, so that people in the same group can learn to care, love, understand and help others, thus forming the habit of being close to and cooperating with others, which will form good interpersonal relationships. The emotional experience in physical exercise is intense and profound, and success and failure, enterprising and frustration, joy and pain, sadness and longing are intertwined, and this rich emotional experience is conducive to the development of emotional self-regulation. Physical exercise can cultivate strong will quality and enhance the ability to resist setbacks. Physical exercise can cultivate students' ideological style of tenacious struggle, hard struggle, perseverance and overcoming difficulties, and help cultivate the spirit of unity, friendship, collectivism and patriotism, as well as noble will qualities such as wit, flexibility, calmness, prudence, enterprising and self-improvement. Physical exercise can prevent mental disorders, treat mental diseases and maintain mental health.

Sports provide valuable activity space, in which people's body and mind, people's subject and surrounding environment, people and people around them can fully blend, thus promoting people's adaptation to the environment, making people achieve physical and mental balance and obtain physical and mental health. Physical exercise has a positive impact on college students' mental health. We were lucky enough to see a message from teacher Yu Chunmin on the Internet and were inspired. On his basis, we also did a set of experimental tests, that is, the data before and after selecting a group of students to participate in physical exercise experiments and not participating in physical exercise experiments are shown in figure 1. As can be seen from Figure 2, through the physical exercise experiment, there are significant differences in the average values of various factors of mental health between students and students in the control group, and the average values of various factors of students in the experimental group have obviously decreased, and the overall mental health level has been greatly improved. It shows that physical exercise is closely related to mental health. In essence, students who often take part in physical exercise can adjust their psychological state in time so that all psychological indicators are in a healthy state. Effective ways and methods of implementing mental health education through physical exercise Through analysis, we have clearly realized that physical exercise has a very positive effect on mental health. According to the law of students' physical and mental development, I think the following ways and methods can effectively educate students' mental health through physical exercise. Infiltrating mental health education in physical education and guiding students to participate in physical exercise schools should attach importance to the teaching of physical education theory courses. By teaching the content of mental health education in physical education theory class, students can understand that real health includes physical health, mental health and certain social adaptability, all of which are indispensable, and understand the standards of mental health. Master the health care methods of mental health physical exercise, so that students can adjust their mentality in time and effectively. Teachers should improve their own quality and inspire and induce students. In the process of organizing physical education teaching, teachers must infect students with personality strength composed of good psychological qualities, such as perseverance, optimism, self-confidence and openness, stand on the height of educating people, help students, inspire and guide them to get a good physical education class, find sports suitable for them, and persist in training and cultivating students' will quality. Weaken and reverse unhealthy psychological tendencies. The combination of diversity and multi-selectivity highlights students' subjectivity. In teaching, we should choose different sports according to the different characteristics of different students, or let the students choose independently, so that each student's interests and specialties can be brought into play. Find the fun of sports and show their talents in the projects they are good at. 3.2 Educate students to participate in physical exercise correctly and promote mental health. Teachers should publicize and guide students to actively participate in physical exercise and cultivate their awareness of physical exercise. Educate students to devote themselves wholeheartedly to physical exercise, relax as much as possible during fitness exercise, listen to music before fitness exercise, and participate in fitness exercise with friends to create a happy atmosphere. Students are required to master the correct exercise methods and common sense of fitness exercise, summarize the exercise effect in time after each exercise, adjust the exercise plan in time according to the physiological and psychological state, effectively overcome psychological obstacles and achieve the goal of physical and mental health.