Refers to the four seasons of spring, summer, autumn and winter. The lunar calendar takes the first month, February and March as spring, which are called Meng Chun, Zhongchun and Ji Chun respectively. April, May and June are summer. They are called Xia Meng, Midsummer and the last month of summer respectively. Autumn, winter and so on. Ouyang Xiu's Preface to the Drunk Pavilion: "The wind and frost are noble and clean, and the water comes out, and it is also in the mountains at four seasons."

Four-season health care is to adjust the functions of various parts of the human body according to the changing laws and characteristics of the four seasons throughout the year, so as to achieve the purpose of health and longevity.

The ancient way of keeping in good health was based on the philosophy of Lao Zi and Zhuang Zi. Laozi said in the twenty-fifth chapter of Tao Te Ching: "People should learn from the land, the land should learn from the sky, the sky should learn from the Tao, and the Tao should be natural." Advocate people to conform to nature.

Zhuangzi inherited Laozi's view of nature, and advocated learning from nature, conforming to nature and further mastering the law on the basis of conforming to the law of nature. "Zhuangzi Tian Yun" said: "Those who enjoy themselves should first treat them with personnel, follow them with righteousness, treat them with five virtues, treat them with nature, and then adjust them to four seasons, and everything will blend in." It is advocated that the weather should be timely and the health should be adjusted under the condition of mastering the laws of the four seasons.

Under the guidance of this holistic view of conforming to the natural environment and the correspondence between man and nature, China thought in ancient times that all life activities of the human body must conform to the objective law of the ebb and flow of Yin and Yang in the four seasons, and thus put forward the principle of keeping healthy in the four seasons with "nourishing Yang in spring and summer and nourishing Yin in autumn and winter" as the general principle.

The changes of yin and yang, seasons and day and night cycles in nature will inevitably affect the physiology and pathology of human body, so corresponding measures must be taken for health preservation. In nature, spring grows and summer grows, and autumn harvests and winter storage. People must also adapt to the characteristics of birth, growth, harvest and storage.

spring

Mastering the characteristics of spring qi rising and relaxing, controlling and spreading the qi of spring yang, focusing on protecting the liver.

summer

Yang is the most abundant and easily metabolized. To make the qi in the body smooth and vent freely, we must show an open mind and pay attention to protecting the heart yang.

autumn

Hide the yin in it, keep your heart calm, converge and protect your lungs.

winter

Keep a closed mind, go to bed early and get up late, keep good spirits and protect your kidneys.