"yeah, this one time I was doing my 45th set of squats with 600lbs., and in the middle of my 12th rep, my hamstring snapped and rolled up my leg. At that point, I had to make a decision: be a pussy and rack it, or keep going for 3 more reps. I wasn't going to let the iron beat me, so I started the three reps of 600lb. single leg squats. On the second rep, I had built up so much pressure in my gut that one of my eyes popped out. I didn't care, I was going to finish that set if it killed me. Yeah, some would say I'm an animal. I'm just doing what I've got to do." http://www.animalpak.com/html/article_details.cfm?section=livin&ID=118 It's something to think about.