It is complicated, and I'm afraid there are no simple answers.

I can recommend Yoga wholeheartedly. I think my practice prior to PMR is what kept me somewhat mobile at the onset. It definitely has keep me sane in the months after diagnosis.

You might try some simple beginner videos on YouTube before signing up for a class. I have a 30 minute routine that I do at home almost everyday. I do go to classes occasionally for camaraderie and inspiration.

Gym workouts bore me to tears though I know the weight bearing exercises are important. I garden and use hand weights, which I think is enough.

Swimming is another GREAT exercise for our poor old joints. There are classes available to me specifically geared for arthritis sufferers. I feel wonderful after I swim.

Good luck!