I don't think I've ever actually hurt myself semi-purposefully. Exercising is probably the closest I've ever been to making myself hurt. Here's the weird thing: (I guess it's weird seeing as nobody else so far seems to be the same way) I actually feel super good when I work out. It makes me feel fresh and hyper. Sure it sucks there for about 10 minutes right afterwards but the rush I get after that is super-duper.