I also exhibit compulsive behavior, although mine's a bit different. I've always run compulsively. A google of "compulsive running" turns up a link to such a behavior being observed in animals suffering from OCD, but there's nothing on it in humans.
The thing is it's not really a... normal sort of compulsion? It seems like a lot of compulsive behaviors are most exhibited when one is anxious (at least, that's been my experience) or are "ambient" compulsions that you don't even notice. I only really get the compulsion to run when my imagination is stimulated. When I'm watching a particularly twisty or good film I get pretty antsy. When I was in elementary school I would run about the playground every which way, lost in my head. I would run and it was like my mind would burst open with ideas and possibilities and narratives, and sensations became incredibly, almost unbearably vivid. That, along with a couple of other things, namely a bad stutter I developed in 1st grade that mysteriously and abruptly vanished in 2nd, led my doctors to identify me as an Aspie kid, although at this point I don't know if that's an accurate diagnosis.
It's become easier to control as I get older, but I still feel that pull on a daily basis. I've used it to channel energy into my cardio workouts, when I'm on the treadmill I'm not usually focusing on anything around me or the run itself, I'm just running and thinking. But I can't utilize it without a treadmill because I only really feel the effect of this compulsion intermittently. It sort of works like a lawnmower that's low on gas. It speeds up and stalls randomly, it sputters out and revs up. So if I try and regulate my running according to what's going on in my head I look fairly foolish, at least according to some of the people I know. I'll run for 20 seconds, then walk for 10, then run for 30, then walk for 60, and so on. It's quite odd. And so I need moving ground under me (as with a treadmill) to keep a brisk pace but the way this process works makes cardio fairly enjoyable for me.
Oh, and I've also bitten my nails for as long as I can remember. When I get really nervous I'll chew them down to the bleeding skin under them. Some of my fingers seem permanently swollen.