Utilizing natural factors such as fresh air, water and sunlight to exercise children’s bodies can make the body more adaptable to changes in climate and hot and cold stimuli, improve health and reduce illness. Some people wrongly believe that children will not get sick as long as they are well-fed and warmly dressed, which is not the case. Some children look white and fat, but the physique is very weak, the reason is closely related to the lack of physical exercise. Infants and young children’s physical exercise: mainly through daily life to carry out, such as sunshine, fresh air, exercise, accept some different temperatures of hot and cold stimulation. As a matter of fact, all the children who have gone through the exercise, the incidence of rickets decreased significantly, respiratory diseases greatly reduced, at the same time, the children’s spirit is pleasant, appetite, sleep sweet, healthy body. At the same time, it can also make children enhance the will to overcome difficulties, sensitive to external things, flexible movements, cheerful personality, intelligent mind. In short, physical exercise is beneficial to the physical and mental development of human beings.