We know that the skin of human body is basically closed pores in winter, which ensures the principle of "no skin leakage". It is further confirmed that when the human body perspires excessively, it will "wash away the qi". Then, according to the theory of Neijing, this is called deficiency of defending qi, which can't keep yin, so it sweats a lot. Dear friends, is it disturbing the sun to sweat more and vent your skin? Please think about it.
So what is "cold and warm"? Here, Neijing tells us a health preserving method: keep warm and keep out the cold in winter. Let's look at winter. People wear thick clothes to keep warm, sleep on hot kang to keep warm, and eat warm food to keep warm. It means "cold is warm". There is even a folk saying that "eating mutton in winter and killing tigers in spring" is a way to keep warm. It is absolutely not to let you go to a warm place away from the cold place, it is purely misleading. Think about it, in a warm place, the yang of the human body begins to float again, the pores open and the skin leaks. Can you do that?
Conclusion: My doctor wants to keep fit in a low temperature place in winter, so that he can hide his ambition and show it to each other. Just like "hide your ambition, if you have private intentions, if you have."
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