Thanks, everyone. In general, I agree with all the advice: Exercise and stay active, but not to the point of adding extra stress to already stressed systems. I maintain, however, that, while acknowledging the caveats and cautions, some weight work (at least, light-duty) is desirable to combat bone density loss.

My bigger point, I think, is that almost nothing seems to be written about exercise in the context of autoimmune diseases. Given the fact that those ailments are almost certainly on the rise, this would seem to be fruitful field for research.

Al