Marc Rippetoe teaches the low bar squat. According to him shoulder flexibility can be an issue. Although I can't recall what he recommends besides just doing the lift to increase flexibility. I have spent most of my squat life doing low as I can go bar, but have recently brought it up a bit.
Rippetoe has a pretty great write up about the low bar squat in his "Starting Strength" book.
Zdravko Veselin Gaeta
I am not a powerlifter nor am I a bodybuilder. I just want to be big and strong.
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