The simplest thing is exercise. The stretching of exercise is beneficial to the increase of vital capacity, which is beneficial to the increase of oxygen content in blood and provides more energy supply for human metabolism.

In fact, through a series of energy transformation, the energy required by various organs is filled, and the basic activities of the human body are better satisfied.

Only when the supply and demand of various organs reach a state of saturation and stability will the human body feel comfortable, which is called the state of keeping in good health.