According to "Chinese yin and yang" theory, acupressure of the foot is linked to the kidneys. The kidneys are very important internal organs, since they are one of the main processors of water in our bodies, therefore they are the root of life. The kidney is the most easily effected organ by cold temperature, so in autumn and winter, maintenance of the kidney is very important. A foot massage can promote blood circulation, reduce the burden on the heart, enhance immunity, accelerate metabolism, promote good sleep, prevent poor circulation (cold hands and feet), prevent indigestion, and detoxify our bodies so that we can function healthily.