We used Box Squats in high school also, I think all the old school coaches do.......but we only used it to get parallel, most kids never go down far enough. When we would get close to the box the spotter, or coach said "up". You never want to hit the box, your legs will start to relax and all the pressure will start being placed on the lower back....In my opinion just have a good spotter who can tell you when you are parallel
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