I have back problems also. I have a ruptured disc (L5,S1) and another messed up disc in my upper back. I couldn't do any squats for several years. I did a set of 5 reps @ 135lbs last year and could barely walk the next day. I started stretching and doing good mornings. And I eventually started doing some leg press. Then started doing light squats. Then I started deadlifting and squatting heavy. I'm fine now...just start slow and you will probably surprise yourself. It seems like you're on the right track though.
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