When squatting (full squats), at the very bottom of my lift my low, low back probably from the tailbone/sacrum to the L1-L3 or so on the Lumbar or something like that caves in and rounds on bottom of the full squat. What exactly causes this? How can I change my position? I use low bar squats, shoulder width, knees pointing out. I have tried making my feet point out more and less, and make my feet wider and narrower, and still get the same problem.
I do work on the foam roller and stretches regularly, and I don’t see it improving. I ordered some squat shoes and hope that they will at least help with this.