In Spa, 4S usually refers to four special spa services: sauna, steaming, massage and spa. These four English words all start with S, so they are called 4S, which is a common service type in SPA. Sauna: This is a kind of hyperthermia. Using steam room (also known as sauna room), the human body is placed in a high temperature and high humidity environment, and the toxins in the body are excreted from the body through sweating, which accelerates the metabolism of the human body and is conducive to relaxing muscles and relieving tension. Sweating: This is a traditional hydrotherapy, similar to hot water bath in Finland. By applying heat energy to the body surface by using the steaming room, this thermal stimulation can effectively enhance the body's immunity, promote blood circulation and improve skin quality. Massage: it is a kind of therapy that uses manual massage to promote physical health. Massage can promote blood circulation, eliminate fatigue, relieve tension and pain, and enhance immunity. Hydrotherapy: it is to stimulate the body and promote health by using various hydrotherapy equipment, such as jacuzzi and progressive massage equipment. These devices can have various functions, such as promoting blood circulation, relieving stress, relieving muscle soreness and so on. , and can be selected according to specific needs.