level of physical activity before with UC and after laparoscopically j pouch surgery

Yes, *successful* J-pouch surgery is much better physically than poorly-controlled (and uncontrollable) UC. That's not really the right question, though, IMO. In order to have successful J-pouch surgery, you had to *risk* unsuccessful J-pouch surgery, and that's no fun at all. Furthermore, if meds could control your UC, the right question, I think, is if J-pouch surgery is better than well-controlled UC. Most of us, I suspect, would prefer to have skipped the surgery if things could have been well-controlled with reasonable medication. Surgery becomes a better option if the control isn't so good, or if the meds aren't reasonable (e.g. actual bad side effects or long-term steroids). If you're going to imagine the worst possible result from medications, it would be fairest to imagine the worst possible result from surgery when comparing them.

I didn't have a choice. I has acute bout of UC that was severe and was on deaths door.  After 16 years with my pouch I was just as or more so active. I work out 4 times a week and walk daily up to 10km.