When an exercise "routine" becomes OCD

We all have habits and routines that comfort us in different areas of life, and physical fitness is no exception. Some people have certain pieces of equipment they like to use, certain clothes they like to wear, and a certain order they like to do things in. But when do these particular little quirks and preferences become full-fledged OCD? It's really only a problem if they get so bad they start to interfere with life by taking up excessive amounts of time, causing marital stress, or costing money, say experts. Routines are "A okay" for the most part, but remember that so is a little flexibility now and then.