This is a good article about how light exercise can help your arthritis;
"Where as running, lifting heavy weights and climbing lots of stairs may increase damage to then knee joint and increase the risk of arthritis, lighter exercise may be beneficial in people at risk of the condition, the annual meeting of the Radiological Society of North America (RSNA) was told.
An American team examined people at risk of osteoarthritis and questioned them about their exercise patterns."
- http://www.telegraph.co.uk/health/healthnews/8162975/Light-exercise-good-for-arthritis-research.html
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Source: telegraph.co.uk