Exercise helps ease aching and swelling.

• Position: Arthritis - Brief article

Achy knees and joints caused by arthritis are not reasons to stop exercising. Regular, moderate exercise improves joint stability and strengthens muscles, according to Mayo Clinic Women's HealthSource. Best of all, people with arthritis who exercise regularly report less pain.

When a person avoids exercise, joints become less mobile and the surrounding muscles shrink, causing increased fatigue and discomfort. A physical therapist or personal trainer can tailor exercise programs to health conditions and fitness levels. The key is to choose safe, appropriate activities and to take it slowly--at least at first:

* Range-of-motion and flexibility exercises such as yoga and tai chi increase joint mobility. Performing them in the evening can reduce joint stiffness the next morning.

* Low-impact aerobics improve overall fitness and endurance as well as muscle function and joint stability. Options include water aerobics, swimming, bicycling, walking, or using equipment like treadmills and elliptical trainers.

* Strength...