Many athletes experience low back pain during lifting. Poor technique when performing deep squats places excessive stress on the low back. In the strength community, debate encircles the amount of pelvic motion allowed during these movements.
Years ago, I wrote an article on low back stress during squats in which I asserted that, particularly with heavy weights, there should not be full pelvic tilting. This sparked serious debate. I didn’t say that no one should squat butt-to-floor, but that each individual is individual. Everyone has soft tissue, anatomical, and structural differences. Ignoring these variations is idiotic!