I understand it is the acid build up that makes you sick, I could be wrong as I remeber reading about from a post in this board. I have also heard about the hormone increase from intense squats. But I got a back injury from doing squats, hurts like hell in my lower back and down my right leg after doing squats (pinched nerve?). Can I get the same effects from other excersie's ? (like leg press, hack squat, smith etc.)