Life reserve is the basis of maintaining the balance between yin and yang. Life reserve is diet, sleep and sex life. These three instincts are the three elements to increase the life reserve and the main link to maintain the balance of yin and yang in the body. First of all, we look at food health, which is the nutrition of life. Food health is to maintain the balance of yin and yang of life through reinforcing and reducing. In addition to diet, it is sleep, charging life. The purpose of our sleep is to adjust the balance of yin and yang, so as to achieve the reserve of life cultivation. Then we advocate sleeping at noon. Sleeping late will lead to loss, energy saving and refreshing. Third, it is sexual health care. Sexual health care is the coordination of life. The great significance of sexual health care lies in coordinating the balance between yin and yang. If the balance between yin and yang is good, it can slow down aging and prolong life.