Sunbathing is actually a good way to keep fit, especially for the elderly. Proper sunbathing can promote the metabolism and circulation of the body. It can not only supplement calcium, but also prevent many diseases, and even supplement vitamin D, which is an element that can promote the body to absorb calcium nutrition. After vitamin D enters the human body, it can be transformed into a very beneficial nutrient through the metabolism of the liver. In the case of sufficient vitamin D, these substances will greatly help the human body to absorb and utilize calcium, which is the principle that everyone understands that sun exposure can supplement calcium. Therefore, sunbathing can really promote the body to synthesize vitamin D. Under the irradiation of sunlight, ultraviolet rays will have a certain impact on people's skin, and the skin will respond appropriately to produce vitamin D. Therefore, sunbathers can supplement the body's vitamin D and calcium substances, but sunbathing should also choose the right time and method. It is not good for your health at any time. According to doctors and experts, many people will greatly increase the risk of skin cancer because of the wrong way of sunbathing for a long time, especially from noon to afternoon, which will lead to skin damage, so we must take adequate sun protection measures to avoid skin damage during this afternoon, so the most suitable time for normal sunbathing is actually after 9 am and before 10:00. Relatively speaking, the time is relatively short, about an hour. During this time, the sunshine is not particularly strong, which can ensure sufficient ultraviolet rays and help the human body to promote the production of vitamin D. However, the longer you stay in the sun, the better. Too long will do harm to the skin. Sunbathing for about half an hour after breakfast is the most suitable time. While sunbathing, you should also avoid direct sunlight on your skin, which will do harm to your skin and some sensitive parts. So sunbathing has many benefits to the body, but we should also take the right way and time to avoid physical injury.