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Originally Posted by
Mark Rippetoe
I sympathize, because I have had similar back pain over the past 20 years. The thing that has made the most difference for me is that about 4 years ago I began diligently stretching my hamstrings every time I train. I have used back extensions, reverse hypers, and deadlifts all successfully to rehab this problem, but since I have been stretching my hamstrings I can get my back in the correct position to lift with much greater reliability, and have had FAR less trouble than I used to have with my back. Hip flexors are NOT the trouble -- if your hamstrings are tight you cannot get into proper lumbar extension. Give it a try, and you'll know in a couple of weeks.