Learn how the ancients kept in good health from ancient books.
Generally speaking, the idea of keeping in good health in ancient books is in Huangdi Neijing. Specifically, you can learn what is said in Huangdi Neijing.
"The law is based on Yin and Yang, and on the number of skills", which is the general principle of health preservation in Huangdi Neijing, and its essential meaning is to live according to the laws of nature. You can go specifically.