I am a certified Arthritis Foundation Exercise Program leader, land-based program. All the exercises I teach can be done seated in a chair. I have had several people in my class who cannot do any of the standing exercises. As part of our training, we are taught how to adapt every exercise for people with physical limitations. Go to www.arthritis.org , click on offerings and programs, enter your zip code, and if there are any classes near you, they'll be listed.
If no classes are available in your area, you can purchase a DVD or videotape of the exercises from the web site.