Group fitness classes that focus on cardiovascular conditioning include step-type classes and dance-based classes, among others. Class levels range from ones conducted mostly in chairs for people with limitations to ones conducted at a very vigorous and challenging level. Group cardio classes provide camaraderie and support, and can be fun for people at all fitness and skill levels. Choose a class that you find enjoyable and presents you with a challenge but isn't so difficult you give up.
However, before you start check with your GP or rheumatologist to see if they think this level of exercise is suitable for you. Also let your instructor know if you have any limitations so they can suggest alternative activities when appropriate.
Specific modifications will depend on your joints affected, but you may consider the following:
Adapted with thanks from the Arthritis Foundation.