it's easier to reach depth when you have a heel and your flexibility isn't there. Not many ppl PLing squat in shoes with a heel though. Goggins is the only one that comes to mind. The reason being (at least in my experience), that when you squat in oly shoes, you don't open the hips NEARLY as much as with chucks. This is mainly because of the narrower stance, where you take a wide stance w/ PLing. When you take a wide stance, and open the hips, you can reach depth easier.
When i squat in oly shoes, and i try to open the hips more than i should, it irritates the side of my leg because you're not supposed to press out on the sides of an oly shoe. The heels are there to put the weight on the heel, and the transference of power (or something like that).
All this said, i hate squatting or doing anything in nike frees except for my everyday walking around shoes. I went to Chad's, and tried pulling in nike frees (even though they're supposed to be like barefoot walking), and was falling forward because of the heel on them. He told me to take the shoes off and pull in socks, and it worked like a charm.
Good pulls!
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