This sentence comes from Dan Tianfang's "The Swordsman of the Prince" 28 times: "He loved martial arts all his life, insisted on practicing martial arts, practiced for three or nine days in winter and three days in summer, and paid attention to diet and rest. Therefore, his life span is very long. "
"Practice for three or nine days in winter and three days in summer" is a proverb that describes hardworking people who are still exercising in the coldest and hottest time of the year. Many people who like sports take it as a guideline, but they should pay attention to keeping warm in winter and heatstroke prevention in summer.
Extended data:
Pay attention to health, and exercise is an important way to keep healthy. Huangdi Neijing said: "In winter and March, this is called Guan Zang. Water and ice are frozen, and there is no interference with the sun. If you go to bed early and get up late, you must wait for the sun. Ambition is looming, and there are private intentions. When the cold disappears, it will warm up, and there will be no skin leakage, so the gas will be caught. This winter air should be the way to keep Tibet.
On the contrary, it hurts the kidney, and it is flaccid syncope in spring. Few people serve the living. "In the cold winter, practicing martial arts can not only enhance physical fitness, but also exercise people's strong will not to be afraid of cold. Enhance the body's adaptability to cold. As the whole body is full of energy, breathing is deepened, digestion is enhanced, metabolism is vigorous, physical condition is improved, and health level and sports performance will be improved accordingly.
Baidu Encyclopedia-Practice for three days in winter and three days in summer