Modern medicine has confirmed that sunbathing in winter is of great benefit to increase the blood circulation of human skin and internal organs, improve hematopoietic function, regulate the central nervous system, increase the vitality of phagocytes, and enhance the metabolism and immune function of various parts of the human body. Especially in preventing and treating rickets in children and osteoporosis in adults, it has special curative effect.

But sunbathing needs science. In winter, there are three periods that are most suitable for sunbathing. The first stage is 6-9 am, when infrared rays are prevalent and ultraviolet rays are low, which makes people feel warm and soft and can promote blood circulation and remove blood stasis. The second and third segments are at 9- 10 in the morning and 16- 17 in the afternoon, respectively. When the A-beam of ultraviolet rays is prevalent, it can promote the absorption of calcium and phosphorus in the intestine, which is conducive to strengthening physical fitness and promoting normal calcification of bones.

In particular, no matter what season, it is best to stay in the sun for a long time from morning 10 to evening 16, especially from noon 12 to afternoon 14. Because at this time, the ultraviolet rays in the sun are mainly B beams and C beams, which will cause damage to the skin and cause various diseases.

In addition, sunbathing for not less than 30-60 minutes every day can balance yin and yang. It is best to wear red clothes when basking in the sun, because the long-wave radiation of red clothes can quickly "eat" the short-wave ultraviolet rays with strong lethality; White clothes are the second choice, and black clothes are forbidden.