It depends on frequency and intensity. Too much exercise increases oxidation status, which leads to excess hydrogen peroxide production in the cells, which is more than likely the root cause of UC. Conversely, exercise increases lymphatic drainage, detox pathways, and endocrine function, all of which tend to be low in UC.
So it's a delicate balance.
When I exercise regularly, especially weight lifting, I make sure I increase my anti-oxidant intake by a lot.
what kind of antioxidant do you eat?