Not bracing your abs creates energy leak that dramatically weakens your form. For example, try benching without squeezing the shit out of the bar, you'll see the difference.
Don't bench press, I get enough of a workout removing lug nuts on large construction equipment and 18-wheelers.
Yeah but if you crunch your abs you swing your legs up taking effort off your arms.
Crunching and tensing/bracing are different things, but you definitely don't want to do crossfit style pullups where you sling yourself up with the momentum, that's gross.
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