The best time to take a bath is 9 pm, because the kidney meridian is weak at this time. At this time, soaking feet, after the body heat increases, the blood vessels in the body will expand, which is conducive to promoting blood circulation, thus promoting blood return in the body. At the same time, the nerves that have been nervous for a day and the kidneys that have been tired for a day can be completely relaxed and fully adjusted by soaking feet at this time to achieve the best effect of nourishing the kidneys, and people will feel very comfortable. Soaking feet does not mean that the higher the water temperature, the better. It is best to control the water temperature below 50℃, and it is better to burn it or not. Feel the water temperature with your feet instead of your hands. A certain temperature of water can stimulate acupoints, cure diseases, preserve health and strengthen the body.