Under normal circumstances, the dynamic change law of human body must be consistent and synchronous with the change law of nature. This consistency and synchronization, expressed by the concept of traditional Chinese medicine, is reflected in the changes of yin and yang. Once this rule is broken due to external or internal factors, it means that human health is destroyed. If it is allowed to develop further, various diseases will be formed. Therefore, it is very important to keep the changes of yin and yang in the human body consistent with nature, no matter from the perspective of health preservation or treatment. What is the rhythm of yin and yang changes in nature? As early as in Neijing, it has been clearly put forward.
Throughout the year, the sun in nature is spring, long summer, autumn harvest, winter storage and so on. The corresponding climatic characteristics are high temperature in spring, hot in summer, cool in autumn and cold in winter. If Yang is blocked in any part of the movement change, it will spread to the whole. The change of human yang should also be adapted to it. Let's look at spring, spring, the birth of the sun, the thawing of glaciers and the revival of everything. The newborn sun is like a budding seedling. Of course, the cold in early spring is hard to resist, so when it is cold, we must find ways to warm it up, just as farmers in the north grow vegetables in greenhouses in spring. The requirement of health preservation is "spring cover". Only in this way can the yang continue to grow, and there will be a lush scene full of yang in summer. Then in autumn, when the temperature turns cold, the yang of nature is hidden, and the yang of human body also turns into a convergent state. If you collect it well, you will have a foundation for next year's hair growth. However, we say that the spirit of the sun dominates the initiative. How can we better hide the spirit of the sun?
There is another principle about the relationship between yin and yang in Neijing, which is "yin and yang restriction". Compared with human yang, the cool autumn climate around the human body is yin, which naturally restricts yang. To a certain extent, the richer the Yin, the stronger the restriction on Yang, and the better the collection of Yang. The essence of "autumn freezing" is to strengthen the restrictive function of Yin Qi, and its health-keeping significance lies in this. Of course, the meaning of "autumn freezing" should be treated flexibly and kept within a certain limit, because the ancients, after all, summed up the law under the social life conditions at that time. At that time, people worked at sunrise and rested at sunset, and their living environment remained relatively unchanged, so the degree of "autumn freezing" was very limited. Now, because people's living environment has changed greatly, the principle of "freezing in autumn" can still be maintained when walking or walking.