There are three factors at work in a spa: heat, buoyancy and massage. Together, they create a relaxing, soothing hydromassage experience.
Immersion in a hot tub raises the body temperature and causes the blood vessels to dilate, increasing circulation. The buoyancy of the spa water reduces body weight by approximately 90%, which relieves pressure on joints and muscles and creates the relaxing sensation of weightlessness.
The massaging action of a spa is created by sending a mixture of warm water and air through hydromassage jet nozzles. This "energized" stream of water loosens tight muscles and stimulates the release of endorphins, the body's natural pain killers.
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