Refers to maintaining, conditioning and supporting life. That is to say, based on the principle of regulating yin and yang, harmonizing qi and blood, and preserving spirit, we can achieve the goal of health and longevity through various methods such as regulating mind, guiding breath, regulating four seasons, supplementing food, supplementing medicine, abstinence, avoiding food and so on.

People's health cannot be separated from two elements: 1) Sufficient qi and blood; 2) The channels and collaterals are unobstructed (including blood vessels and garbage discharge channels).

The highest realm of traditional Chinese medicine is health preservation, and the highest realm of health preservation is nourishing the heart. So as far as health is concerned, corporal fitness, sergeant fitness and staff sergeant fitness. It's the same to see a person. It is better to observe qi than to observe heart.

Conforming to nature is the highest state of health preservation. When a person is born, his fate is basically fixed. What he should do, what he should not do, what he should eat and what he should not eat. If he can follow his luck, he will be safe. An enlightened person will discover and know his luck, and know what he should and should not do. Therefore, keeping in good health is definitely not a simple imitation, and people follow suit. Don't envy others, find your own understanding from your own heart. So how can people find out if they let nature take its course? Actually, it's too simple. You are sick, you are uncomfortable, you are uncomfortable, then you are against nature. It is indispensable to conform to the nature of the outside world and the nature of one's own inner destiny.