Reverse immersion hydrotherapy refers to an experience different from traditional hydrotherapy. Instead of putting customers in water or soaking in a hot pool, it stimulates the senses and body through steam and high temperature to achieve the effect of relaxation, understanding and healing. This kind of spa generally uses artificial gas and heater to produce high temperature and humidity in a closed space, which makes people sweat and relax, thus promoting blood circulation and health. This kind of spa is sometimes called "Korean Spa" or "Japanese Steam Spa"