being a ulcerated colitis sufferer in the past,touch wood i have not had a problem for many years,it is a drain on your body you do not feel right ,unable to take nutrients from food and feelings and urges to go to the toilet,I always tried to do exercise when i felt like it ,and then just built on that,i never rode when i suffered only gym work,but i worked the way through it,maybe start doing small circuits not going to far from home,turbo i would say you will sweat a lot not the best idea if you are having a bad attack,cramps may have been a bit of dehydration?you can dehydrate quicker,consume water little and often ,and just build up,your consultant should advice you of what you should expect,and what you limits are,and if you flare up does not subside make sure you seek his advice,i was discharged many years ago,once you get your confidence up i am sure you will build on your results,take care and good luck