How about swimming in winter? Chinese medicine believes that winter should be the season of collecting gas. It is reasonable to swim in winter for health, but people who swim in winter look in good health. Why? The book says that winter should be the season of gathering gas, but in fact nothing is absolute, because everyone's physique is different, so if it is the first time to swim in winter, you should adapt slowly. It's best to start exercising when the weather is hot, gradually transition, and often check your physical condition. If you feel uncomfortable after swimming, don't swim.