Three diligence, three quietness, three dullness and three pleasures are regarded as the highest realm of health preservation, because as long as you can achieve these four "three" and ensure that you can live to be over 100 years old, people who want to become "old goblins" should learn quickly. Three diligence: brain diligence, hand diligence and foot diligence. Three static: meditation, static, static. Three dark: look down on power, look down on money, forget age. Sanle: Help others and be content.