"Soak feet in spring, and the sun will rise. Soak feet in summer, and you will get rid of dampness and heat. Soak feet in autumn, and you will moisten your lungs and intestines. Soak feet in winter, and your elixir fields will warm." The health preservation method of soaking feet is suitable for all seasons. Hot water soaking feet is foot bath, which belongs to the content of traditional Chinese foot therapy and is also a commonly used external therapy. Foot bath has a history of thousands of years.