Maintain the balance of qi and blood: qi belongs to yang and blood belongs to yin, so it is necessary to maintain the balance of yin and yang, and of course to maintain the balance of qi and blood. Qi is the most basic substance that constitutes the human body, and blood has the function of nourishing and moistening the whole body. Qi deficiency will lead to blood deficiency, and blood deficiency will carry qi. Therefore, the balance of qi and blood is particularly important for good health.