Hydrotherapy is the use of water to heal. There are three factors at work in SPA: heat, buoyancy, and massage. Together, they create an experience that is both relaxing and healing. The recuperative and healing properties of Hydrotherapy are based on the body's reaction to hot and cold stimuli which invigorates the circulation and digestion encouraging blood flow and lessening pain sensitivity. Generally, heat calm; and soothes the body slowing down the activity of internal organs. Cold, in contrast, simulates and invigorates, increasing internal activity. If you are experiencing tense muscles and anxiety from your stress, a hot shower or bath is in order. If you are feeling tired and stressed out, you might want to try taking a warm shower or bath followed by a short, invigorating cold shower to help stimulate the body and mind.