Editor's note: Tao is the origin of the universe and the law governing all the movements of the universe. Taoist health preserving summarized the ancient medicine and Qigong in China, and combined with Taoist practice, achieved the purpose of prolonging life. And "harmony between man and nature" is the highest standard of Taoist health preservation. "Those who are good at health care, nourish their hearts, shape and bones." . Health preservation is not only to exercise and nourish bones and muscles, but also to nourish our minds. And now the social environment is under great pressure, and everyone is busy living for fame and fortune. I have no time to care about my mood and health. Often when a person succeeds, his mind is distracted and his body is gone. So, how to raise your heart? How to reach the highest level of health care? This requires people to understand our oldest traditional culture-Tao. Tao is the foundation of the universe. The key to Taoist health preservation is the unity of man and nature. How to realize the harmony between man and nature? Laozi said that "people everywhere, the earth follows the sky, and the sky follows nature", which is both regular and different in size. The laws of a certain time and space are not immutable. For example, in winter, the north is MINUS ten degrees, and the south is still warm as spring. The "nature" in Taoism refers to this great law in the universe that has no beginning and no end, from small to subtle to infinite. You can't see her, but you experience her all the time. All the year round, spring, summer, autumn and winter, wind, frost, rain and snow, cold coming and summer going ... health can know to let nature take its course, that is, it really begins to approach everything in the world. Only in this way can heaven and man become one. Everyone is a small universe, each with its own uniqueness. And everyone is more or less receiving information and inspiration from nature and the universe. When the small universe of human body is very consistent with the big universe of nature, there is no deviation, which is the highest state of harmony between man and nature. At this time, the significance of health preservation is not only a healthy life, but a healthy life in this world that exceeds the life span of a group of ordinary people. Nowadays, mass medical care only stays on the basis of health. I think a healthy diet and reasonable exercise can make me healthier. The quality of life will be improved a little. But no one suggested living longer. The idea of a comfortable life. And many things in Taoism reveal the secret of longevity. There is a certain limit to human life. The so-called limit refers to the age at which natural life can live, which is called "natural year" by Chinese medicine. So, how old should people live? Huangdi Neijing thinks it is a hundred years old. For example, when talking about ancient naivety, Su Wen said, "To live to a hundred years old is the end of a person's life." The Book of Rites calls centenarians "Yi". Shangshu also puts forward that "one life is 120 years old", that is, one can live to 120 years old. The great philosopher Wang Chong said: "A hundred years old is a positive number of years. Things still die in autumn, and things are in the right period. " Ji Kang, a famous health expert in Jin Dynasty, thinks that "longevity" can reach 120, which is "the same at all times". According to the above, people's life span should be around 100- 120 years old. But the reality of society tells us that most people can't reach their natural life span. Why can't you enjoy the "days"? The fundamental reason is that heaven and man can't be one. Can't let nature take its course. What is the most precious thing in life? -What is the most precious thing in life? -What is the most precious thing about health? -Healthy! What is the key to keeping in good health? -Nature!