2. What effect does physical exercise have on children's physical and mental health?

1. The promotion of leisure and recreational sports activities to health (1) has a good influence on the health of people of different ages. Although the contents and forms of leisure and recreational sports are various, sports activities are the most important means and methods. It has a positive role in promoting the health of people of different ages. In a sense, it is the enhancement of human organism life. For children in the growing stage, leisure sports activities can promote the normal development of the body, improve the functional state of various organs and systems of the body, develop their physique in an all-round way, promote their health and lay a good foundation for lifelong health. For the young and middle-aged people with the greatest life pressure, leisure sports activities can play a role in maintaining and protecting their health. For the elderly, leisure and sports activities help to keep healthy and delay the aging process. Modern society is getting older. How to keep healthy while prolonging life is not only the wish of the elderly, but also the demand of society. (2) Good influence on main body functions 1. Influence on the function of cardiovascular system Worldwide, cardiovascular diseases have become the "first killer" that harms human health. A large number of epidemiological investigations and experimental research results reveal that although cardiovascular diseases mainly occur in middle-aged and elderly people, they often originate from children, and many factors called "risk factors" can accelerate the occurrence and development of such diseases. Some of these factors, such as family history, age and gender, are related to behavior and lifestyle. Such as excessive psychological pressure, hypertension, hyperlipidemia, obesity and overweight, smoking, bad eating habits, insufficient physical activity, low physical fitness and so on. In other words, most cardiovascular risk factors can be improved by changing lifestyle. One of the most critical behavioral factors is to strengthen physical exercise. Studies have revealed that moderate physical activity can improve hypertension and hyperlipidemia, obesity and overweight, relieve psychological stress and improve physical fitness. 2. Influence on the function of motor system One of the characteristic changes of human aging is the decline of muscle strength, osteoporosis, joint mobility and motor ability. One of the important ways to delay the aging process through leisure sports activities is to effectively maintain muscle strength, increase and maintain joint flexibility, and maintain or even enhance bone density. 3. Influence on immune system function Immune function marks the human body's resistance to diseases, so it is a representative indicator of human health and physique. A large number of epidemiological investigations, animal experiments and human experiments have confirmed that long-term high-intensity and large-amount exercise training will lead to obvious immunosuppression, which will reduce immune function and resistance to various infectious diseases. Long-term moderate physical exercise is conducive to promoting immune function and enhancing resistance, and the prevalence rate of various infectious diseases is significantly reduced. These results show that leisure sports activities can obviously improve the immune function of participants. Second, the promotion of leisure and recreational sports activities to mental health (1) Leisure sports help to regulate tension. Today's world is a fast-paced and efficient society, which inevitably brings a lot of tension and pressure to people and also causes bad emotions. Nervous mood will reduce and inhibit human immune function, while good mood and stable mood are conducive to maintaining and promoting the stability of human function. Leisure sports activities have the functions of regulating human tension, improving physical and psychological state, and helping to restore physical strength and energy, which is an important content of people's lives. (2) Leisure sports that help to promote interpersonal communication are not only the carrier of leisure and fitness, but also the lubricant to eliminate loneliness, expand communication, enhance emotional communication and make friends. Through leisure sports, people can get to know many people of different identities, ages and genders, enrich their spiritual life and enhance their emotional communication. No matter among colleagues in schools, enterprises, families and units, leisure sports have become an effective way for people to communicate emotionally. It can be said that leisure sports have become an emotional bridge between people in a sense. Three. Countermeasures for developing sports leisure and entertainment activities (1) Scientific planning of venues and facilities for sports leisure and entertainment activities should be reasonable and scientific, and it is necessary to provide convenience for mass fitness activities. Actively guide, support and encourage society, overseas Chinese, collectives and individuals to set up various sports and fitness places. In accordance with the principles of scientificity, interest and comprehensiveness, combined with the population size, different personnel qualities, personality preferences and consumption levels of residential communities, we will vigorously develop sports venues, sports parks and leisure squares with various forms and rich contents, so as to provide convenience for more people to exercise in fitness places, give more people the opportunity to entertain, relax and exercise nearby, and realize that all public sports venues are open to the society. (2) Strengthen sports leisure and entertainment education, and quickly popularize healthy and active sports leisure and entertainment activities. Set up sports leisure and entertainment specialty in colleges and universities with related disciplines, and cultivate talents with sports leisure and entertainment professional knowledge and technical ability. Establish a healthy and positive concept of sports leisure and entertainment, and correctly understand sports leisure and entertainment.