The buoyancy of water takes the weight off the spinal vertebrae, facilitating movement in ways not possible on land. Watsu's gentle stretching and pulling promote flexibility and suppleness of the spine.

Pregnant women benefit greatly from Watsu, as do athletes, those suffering from sore muscles and joints, arthritis, multiple sclerosis, and conditions such as Fibromyalgia and chronic pain. It is useful both before and after surgery pertaining to major joints in the body.