Originally Posted by Steven Low
Box squats and/or squats with your toes an inch or two from the wall.
Basically, they force you to sit back.
Stretch hip flexors, hammies, quads, etc.
I have done this exercise before when squatting PL style, with a very wide stance. However, when doing a high-bar Oly squat, wouldn't your knees hit the wall? Maybe I just have long legs, but if I put my toes an inch from the wall my knees hit the wall as I'm descending into the bottom portion of the squat.