There are.

Unfortunately, for those of us who do cut, we often even abuse exercise. Too much of even that is a bad thing.

(I both cut and over exercise)

It's an addiction to the endorphins in my case. I either cut or exercise for several hours every day. It's lose/lose for me. As one leaves me feeling constantly drained, and the other leaves scars.

I'm glad to hear you would never cut. It's something I've lived with since middle school. I wish I had never started.

ETA: To explain it in more depth, the endorphins - for me, at least - provide a temporary distraction from depression. I would imagine that the endorphin rush feels good to me long enough to make me forget (for at least a moment) how down I was seconds before. Of course, the crash comes later. After both exercising, and cutting. The crash is when the endorphin rush is gone, and I'm either sitting on my bed staring at what I've done.. or collapsing to the floor because I pushed myself too hard. And when the crash hits, I find that I often want to go again for that endorphin rush.