Thanks for this, Rip. After comparing the photos in the article to my last squat workout, I need to improve my lumbar extension at the bottom. I recall hearing you say once that lumbar hyperextension is not really a risk for deadlifts except for women or skinny guys. Is the same true on squat? Meaning, practically is there a risk of lumbar overextension as I focus on this? I'm 6'1, 230, and not particularly flexible. Any thoughts would be appreciated.