I've been having this lower back pain lately and its getting as bad as it was before I started lifting. I was born with flatback syndrome. In other words, normally we have a curve in the lumbar spine. I don't. I started powerlifting in the first place to get my back stronger thinking it could help. It has for a while, but its coming back. Anyway, I was wondering if anyone knows of really good Ab strengthing work I can do... what exercises work for you? I don't need a six pack as much as correct pelvic tilt and no back pain. I would love to contined doing straightleg sit-ups but I can only do those when I'm not in pain which is becoming more rare now.