Ive been doing low rep squats (3x5, 5x5) for many years now. Ive upped my 1RM from a measly 135 to an acceptable 405. With that said, I hurt my lower back and am experimenting with high rep/low weight squats. What Ive noticed is how dreadful I am with high reps. I could not finish 3x20 with 30...