Actually my current squat 1RM was done to a bench with a 2 second pause. The 2 second pause causes your stretch reflex to dissipate, making it harder to get out of the hole.
As others have said, when I box squat, I usually do my last few warmup sets to the box to make sure it's at the right distance and get the feel of it. It's not all that much different from squatting free, but it definitely forces you to focus more on sitting BACK when you squat.
"Generally people can't squat because they're lacking in the 'lower ab' area. As in they need to grow a set." - LtL
"No one ever got big or strong by lifting lightweights" - Carl1174
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Valentin Konstantin Platz