Arthritis and Warm Pool Exercise

By H. Rand Scott, MD — Medical Director, Newport Pain Management Reviewed and updated July 2026

Warm water is one of the oldest pain treatments there is — and for arthritis, it remains one of the best. Warm water therapy relaxes muscles, eases pain and stiffness, and lets many arthritis sufferers exercise in comfort that dry land can't offer. In Orange County, where heated pools are easy to find year-round, there's little excuse not to use this one.

Painful joints make you want to hold still — but immobilized joints lose range of motion, ligaments and muscles weaken and shorten, and the result is more pain and stiffness, not less. Regular movement keeps joints mobile, preserves flexibility and strength, and protects against further damage.

Water solves the arthritic exerciser's dilemma: buoyancy supports your weight and takes stress off the joints, allowing freer movement, while the water itself provides gentle resistance that builds strength. You get the exercise without the impact.

The water should feel soothing and comfortable — not hot. Extreme heat isn't safer or more effective, just harder on your body. For actual exercise, pool temperatures of 83–88°F are ideal. For gentle soaking in a spa, warmer is tolerable, but keep sessions to 10–15 minutes at 98–104°F, and remember that older adults are more prone to overheating. New spa users should start short and extend gradually.

Many people with arthritis find morning soaks best, since pain and stiffness peak on waking. But afternoon sessions relax joints after a full day, a pre-exercise soak loosens muscles before land exercise, and an evening soak can set up a more restful night. There's no wrong time — the right time is the one you'll actually do consistently.

Ease in: relax in the water first, begin exercising only when muscles and joints feel loose, and allow wind-down time before getting out. Submerge the body part you're exercising, move it slowly and gently through its full comfortable range — never forcing — and do three to eight repetitions as tolerated. Begin and end with the easy movements.

The safety rules: get out immediately if you feel lightheaded or nauseated; stop and call your doctor if joint swelling, stiffness, or pain increases; never use a pool or spa after alcohol or sedating medications; and if you're pregnant, check with your doctor before using a spa. Have someone nearby your first few sessions — getting in and out is often the hardest part. And remember that warm water is subtly fatiguing: pain lasting more than an hour or two after exercise means you overdid it, so cut back next time.

The Arthritis Foundation offers aquatic exercise classes through local chapters — a good way to learn a routine under supervision. And if arthritis pain is limiting you despite regular exercise, call Newport Pain Management at (949) 759-8400 — there's more we can do.

This article is for general education and is not a substitute for individual medical advice.