A close family friend had a ileostomy (very similar to colostomy) ten years ago. She is still able to be extremely active (running, yoga, weight training, etc) and doesnt have any doctor-imposed restrictions on movement. She’s told me that her biggest complaint is the tendency to get heat rash around the area the pouch rests on her abdomen when she sweats for long periods of time. She also occasionally gets “twinges” doing twisting or crunching motions & modifies as needed (because the muscles of the abdominal wall were affected by the surgery). She jokes that she’ll never ride a bike because it is uncomfortable on her bottom (the rectum is usually sealed off during surgery & muscles/ scar tissue affect that area as well). Another consideration is that since a section of the intestine has been removed it’s harder for these clients to stay hydrated & properly fueled nutritionally. It may take some practice on the client’s part to determine how much water is enough if they aren’t accustomed to exercise. I hope that’s helpful!