I have long recommended to patients that they try yoga or ti chi. They both work your entire body in ways that are very applicable to use in the real world. If done correctly they can even reduce pain and help injuries heal quickly. For those who suffer from arthritis pain, one of these systems are essential. They will improve balance, strength, flexability, and core strength amoung other benefits. I have been doing Iyengar yoga 2 to 4 times a week for years. It keeps me balanced and loose, and I feel that it will put off the onset of arthritis. And if you have arthritis, these systems can reduce the pain and irritation that accompanies arthritis. This article gives a good introduction to these 2 exercise systems.