Why should we nourish yin and prevent body fluid and qi from disappearing in autumn?

The six solar terms in autumn are the season when yang disappears and yin grows. Just after the heat of the six solar terms in summer, the yang of the human body is gradually suppressed, and the yin essence is constantly flourishing. Therefore, people live in harmony with the autumn atmosphere and maintain the yin essence in the body. On the one hand, this is to adapt to the law of the gradual rise and prosperity of Yin Qi religion. People should conform to the trend of natural accumulation, collect Yin Qi, and condense essence, so as to nourish the five internal organs, resist diseases and prolong life. On the other hand, it also prepares for storing yin essence in the six solar terms in winter, and further lays the foundation for the growth of yang in the coming year, thus maintaining the balance of yin and yang in the human body. Therefore, in the six solar terms in autumn, don't damage the spirit of yin essence. This is what people often say "nourishing yin in autumn and winter". The six solar terms in autumn should also prevent excessive strain and Yin Qi from leaking out, because excessive strenuous exercise will make people sweat too much, leading to the loss of body fluid and qi and blood.