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Matt,
A lot of times, tight hamstrings can also be the reason for hip tuck at the bottom of a squat. The hamstrings will lengthen has the hips get pushed back and the back stays in extension. Once the hamstrings reach their end point, the hips tuck and the lumbar area goes into flexion (rounds). Ankle mobility could also be a culprit, but more than not I think it's usually the hams. With all that said, most people can't do true ATG squats without some lumbar rounding.
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