Harold Dull (1935-2019) was an American aquatic bodyworker and poet best known as the creator of Watsu, originally developed in the early 1980s at Harbin Hot Springs, California. He is also known for his poetry, as founder of the Worldwide Aquatic Bodywork Association (WABA), and as creator of Tantsu and . Watsu is a form of aquatic bodywork in which a practitioner or therapist gently cradles, moves, stretches, and massages a receiver in chest-deep warm water for deep relaxation and aquatic therapy.