So I got to the gym yesterday to do legs. I stretched properly and began with some warm-up squats. On my first set I did 8 reps with slight little pain in my R quad, near usual injection site, but not right where I usually shoot. I don't really think anything of it, and decide to work it out and hope the pain subsides. I add 20 lbs and did 1 rep w a little more pain, keep going, on my 2nd rep i go down, and just as i start to push up I hear a "pop" right where the pain was (It must have been loud because i easily heard it even with headphones on). As soon as i heard the pop the pain went from kind of bad to SEVERE pain, felt like someone stabbed me with a knife. My first thought was "i'm not going to get this up, it hurts too bad", I was going to dump the bar behind me but found the strength to get it up (I did not want to dump that weight and make a scene in front of the whole weight room). I racked the weight, stretched it out, and decided that I could not do legs. Now, going from sitting to standing and vice-versa hurts bad in the exact spot. Getting off the crapper is the worst. I rode the bike today trying to work it out a little, but can still feel the pain. any idea what happened? This is driving me nuts because i can't workout my legs until this goes away.