Tree Day, or our Christmas Before Christmas tradition

The end result of our Tree Day is the best of both worlds:

We get to have Christmas our way, with the just two of us, and when the real Christmas rolls around a couple of weeks later, we get to spend quality time with our families. It also serves to make the erection of the Christmas tree decorating its own special ritual, when it could be seen as just a chore.

Is there yoga for people who can't do yoga?

On my rheumatologist's recommendation, I don't do yoga, because if I stretch too far I'll damage my joints. However, I would really like to find something else that combines meditativeness with motion. Is there a "yoga for people who can't do yoga"?