Watsu combines water with Shiatsu, a form of Japanese "finger pressure" massage applied to the body zones defined by chi, or the body's energy channels. Watsu was developed in 1980 by Harold Dull, who traveled to Japan to study Zen Shiatsu, a form of massage using stretches and touchpoints to release blockages. Back in America, Dull promoted the benefits of performing Shiatsu moves and stretches in warm water. Watsu, like reflexology, can enhance feelings of well-being and relaxation.

A warm spa (95 to 97 degrees F or 35 to 37 degrees C) is a perfect environment for a Watsu aquatic bodywork session. Floating in water supported by the Watsu practitioner, the Watsu receiver passes into a state of complete relaxation as gentle stretching is applied to specific points.