Exercising in a pool has significant health benefits for a person with arthritis. The soothing warmth and buoyancy of warm water make it a safe, ideal environment for relieving arthritis pain and stiffness and improving the range of movement of joints affected by arthritis. Immersing in warm water raises your body temperature, causing your blood vessels to dilate and increase circulation. Water supports joints and lessens stress on them to encourage free movement, and may also act as resistance to help build muscle strength. Using a spa adds a third component to the therapy – massage. Jet nozzles release a mixture of warm water and air, massaging your body and helping you relax tight muscles. Talk with your doctor to determine whether water exercise is appropriate for you.
(Source: Arthritis Foundation)