I was teaching and practicing a really active form of yoga while on pred, and I lost all my muscle-tone, which was a drag, but it came back after getting off pred. I was also REALLY flexible, which was kinda cool. it seems to me if you feel good, go for it.
48 y/o woman. Diagnosed 4/06 after colonscopy, SBFT, CT-scan all showed crohns. 3 months later, after pred and remicade, all tests showed no crohns. In December had adhesions cut through a laparoscopy. Now just taking Glycolax, metamucil and vicidin as needed.