Water is a fantastic medium for low-impact exercise. This is especially true when the water's warm, ranging between 83 and 88 degrees Fahrenheit (28.3 to 31.1 degrees Celsius). Submerging the body in warm water increases the body's temperature, which also increases circulation [source: Arthritis Foundation]. One of the reasons water provides a healthy place to exercise is its buoyancy removes much of the weight off your joints and muscles. Water also adds resistance for your extremities, helping build strength. Water exercise options include swimming laps, walking in place in deep water or water aerobics classes [source: White]. Hot tubs can also be therapeutic ways to massage aggravated muscles and relax after a workout.