Range-of-motion (ROM) exercises are beneficial if you have fibromyalgia because they reduce stiffness and help keep your muscles and joints flexible. The range of motion is the full range in which your joints can be moved in certain directions. A physical therapist can teach you appropriate range-of-motion exercises.
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You should try to move your joints through their full range of motion every day. Daily activities such as housework, climbing stairs, dressing, bathing, cooking, lifting, or bending do not dependably move your joints through their full range of motion and should not replace range-of-motion exercises prescribed by your doctor or therapist.
(Source: Your Personal Guide to Living Well with Fibromyalgia – An Official Publication of the Arthritis Foundation.)