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How to box squat 
Move the bench up or down. 
If you're at the gym, many benches have adjustable heights. That way, you can adjust the bench to where you need it to be.
Ideally, the box will be at an height where you've reached a parallel squat, or in other words, where your knees become parallel with your hips. If you are a beginner, you can make it a little higher so you can adjust to this move over time.