A: The significance of health preservation is mainly reflected in three aspects: First, to enhance physical fitness. Because people with strong physique are full of healthy qi and have strong anti-evil ability; People with weak constitution have poor ability to resist evil spirits because of lack of healthy qi. Therefore, physical fitness can be enhanced through diet nutrition, regular daily life and physical exercise. The second is to prevent diseases. The harm of diseases to human health is obvious, which will weaken the function of human organs, dissipate the essence in the body and shorten people's life span. We can prevent diseases and maintain our health by keeping healthy qi and preventing the invasion of evil spirits. The third is to delay aging. Aging is closely related to people's life span. Mastering the way of health preservation and proper adjustment can delay aging, prolong life span and achieve the purpose of maintaining physical and mental health.