1 The body can supplement calcium by sunbathing. Ultraviolet B contained in sunlight can promote the formation of vitamin D. Sunlight is also the main source of vitamin D. Vitamin D can promote the absorption of calcium and phosphorus in the body and contribute to the formation of bones, so don't resist the sun too much in daily life. In dog days, you can dry your back in the morning or at night when the sun is not very strong.

It is a Chinese medicine health care therapy to dispel cold and tonify yang. Chinese medicine believes that the abdomen is yin and the back is yang. According to this theory, the yang meridian of the human body runs on the back, and the Du meridian on the back is in charge of yang. The ancients called Du Meridian "the sea of Yang Meridian". Sunbathing the back in dog days can dispel cold and dampness in the body, dredge meridians and tonify yang.

3 Improve the mood The temperature is high in the dog days. Many people stay in air-conditioned rooms for a long time, and often stay in air-conditioned rooms, which makes people feel sub-healthy. The human body can't sweat smoothly for a long time, and it is also prone to sub-health state. If you bask in warm but not strong sunshine in the morning and evening, people will feel warm and comfortable, because under the sunshine, the secretion level of adrenaline, thyroxine and gonad in the human body will be improved, which can effectively improve depression and depression.

4 Enhancing immunity Yang qi is the power to support the operation of human viscera. When the yang in the body is sufficient, the body's ability to resist diseases will be improved. Huangdi Neijing also said: "If Yang is lost in the sky, if the sun is lost in the day, it will be harmful to life." Sunbathing is the most convenient way to supplement yang. In cold weather, drying the back can not only benefit the spleen and stomach, but also help improve the digestive function.