General exercise can improve the immunity of the body. Exercise can improve human immunity, mainly as follows:

First of all, exercise can promote muscle development, strong bones and flexible joints.

Second, exercise can improve bone metabolism and make bones firm. Without exercise, osteoporosis will occur, and bones will be brittle and easily broken.

Third, exercise can enhance cardiovascular function, make the heart contract strongly and supply sufficient blood.

Fourth, exercise can increase vital capacity and enhance lung function.

Exercise can promote the metabolism of substances in the body, and the body can make full use of energy substances and oxygen.

6. Exercise can also regulate the process of excitement and inhibition of the central nervous system, so that its activities tend to be balanced and flexible, which is conducive to adapting to changes in the external environment.