Is keeping in good health and releasing water a verb or a noun? It originally refers to a medical activity of Taoism to maintain life, strengthen physique and prevent diseases through various methods, so as to achieve longevity. Raise, that is, the meaning of nursed back to health, maintenance and tonic; Life means living, surviving and growing. In the modern sense, "health preservation" refers to the active physical and mental maintenance activities for material and spirit according to the laws of human life process.