The Arthritis Foundation says the 40 million American arthritis sufferers not only can but should exercise. To help, Exercise can Beat Arthritis, a new tape put together by Valerie Sayce, a physical therapist at the Arthritis Foundation of Victoria (Australia), offers some critical dos and don’ts — for instance, here pain means no gain. Each segment has a specific purpose set to music that ranges from sedate classical to Chaplinesque ragtime. Overall, this is a safe, sound program for people of all ages with arthritis. B+