Arthritis and its close relative, fibromyalgia,can affect either a single or often multiple joints. It is characterized by the errosion of bony surfaces and their articulating tendinous and ligamentous structures. This renders the joint unstable and painful. Exercising on land may no longer be an option as the bones are further compressed by the effects of gravity. The pool provides an excellent alternative for strengthening and cardiovascular fitness by decreasing weight bearing through the joints.