Aquatic therapy is simply water therapy. Water virtually eliminates gravity to enable movement that may not be possible on dry land. Depending on the depth of the water, weight bearing can be virtually eliminated enabling the patients to perform exercises in a gravity free environment. Gentle water exercises use the water's resistance to build muscle strength and flexibility. Warmer water induces vasodilatation. Vasodilatation is an enlarging of the blood vessels resulting in increased blood flow which delivers more oxygen and nutrients to speed up healing and remove waste products. The warmth of the water also relieves pain, relaxes tense muscles, and decreases muscle spasm, and increases range of motion.