Hydrotherapy and relaxation: The primary purpose of a whirlpool bathtub is to provide hydrotherapy and relaxation. Whirlpool tubs feature an array of jets that release streams of water and air into the tub, creating a soothing and invigorating massage effect. This massage action helps relieve muscle tension, promote circulation, and provide overall relaxation and rejuvenation. Soaking in a whirlpool tub can be an excellent way to alleviate stress, reduce body aches and pains, and improve sleep quality.