Water exercise, in a floatation device, eliminates the effects of gravity and allows free movement. The most important thing about water exercise is that it challenges the whole brain. Water . Exercising in water allows you to have less stress on your joints. When the water comes up to your neck, your joints are only supporting about 10 percent of your body weight. The water: . Recovery Exercise #3: Two Arm Swing Start Position: Feet wide (or narrow) Arms: Right and left rotation at surface 1a.