Quite a few J-pouchers on here have done strenuous or extensive exercises and they have suffered: bowel twists, blockages, hernias, among other things. The major problem I heard recently was from a guy playing basketball and his J-pouch popped. Everyone that has a pouch/ostomy needs to be extra careful and avoid: strenuous, extensive, and weightlifting exercises; a lot of people on here chance things anyway, some of them never get hurt or suffer consequences, but a lot of them do suffer consequences. I think you guys need to ask yourself is it worth the risk? My personal opinion is that its not worth it.