Sunbathing in winter has the effect of promoting blood circulation, strengthening the body’s immunity, preventing osteoporosis and regulating emotions. 1. Winter sunbathing produces warm stimulation to skin tissues, which can improve the nutritional status of skin tissues. Ultraviolet radiation can enhance skin resistance. 2. The infrared rays in the sunlight can penetrate into the tissues below the skin, and the warming effect can make the blood vessels expand and promote the blood circulation of the whole body. 3. Poor immunity of the body of the crowd, often sunbathing in winter, can enhance the body’s metabolism, but also to improve the body’s resistance. 4. Regular sunbathing in winter has the effect of supplementing vitamin D, which can promote growth and prevent the occurrence of rickets. The sun has many benefits for the human body, but, to choose a good time to sunbathe. For example, in winter, sunbathing should generally be selected in the morning at eight or nine o’clock, when the sun is warmer. However, 10 o’clock at noon to 4 o’clock in the afternoon, generally should not sunbathe, to avoid damage to the skin.