My squats have been sucking lately, can't move up in weight, etc. When I go down and start to go back up, its not my legs that can't get the weight up, my back will "tweak" out or move slightly and then it causes me to start falling forward. What exercise(s) should i do to strengthen my back for squats? I've been halfassing deadlifts for 2 or 3 months now...could that be it? Or some other back exercise I should do?