I suspect experts might not agree, but I find it useful to think of my mild OCD as a separate gremlin that lives in my head. One like a friendly and over enthusiastic dog that can only barely be trained, but responds disproportionately well to being distracted by small and (to me) insignificant rewards. I can also take OCD walkies (it especially likes walking perimeters and zig-zags) to get my own exercise, and do so most every day.