Yin-yang theory has certain guiding significance for health qigong exercise. In qigong, the theory of yin and yang refers to how to deal with two opposing qi. What can be done to achieve balance. The qi of yin and yang refers to the qi of heaven and earth, the qi of cold and heat, the qi of good and evil, and the qi of up and down. Qi of heaven and earth: refers to Yang Qi on the ground and Yin Qi underground. According to personal characteristics, how many qi of heaven and earth are absorbed. For example, a masculine physique (male) can absorb a little more yin; Feminine physique (female) can absorb more yang to achieve the balance of yin and yang in the body. Cold and hot qi refers to yin (cold) and yang (hot) qi outside the human body. How much yin and yang qi you absorb according to your constitution. Just feel warm. Qi of good and evil: refers to healthy qi (Yang) and various evil qi (Yin) when practicing Qigong. According to one's own constitution, absorb healthy qi and drive away evil spirits with one's mind. Upper and lower qi: refers to the problem that the vital qi of practicing Qigong gathers in the upper (yang) and lower (yin) of the body. When practicing qigong, you should be careful not to gather the true qi in your head, which will lead to imbalance of yin and yang in your body, top-heavy, and easy to get possessed.