Ah, but if I don't roll my hips back, my abdominal region will not retain its flat appearance. We are all built differently. And in doing so this also keeps the buttocks tucked in, both retaining a natural, not forced appearance. Despite what we are taught this makes it clear that we have to take everything and adapt the "lesson" in posture to fit ourselves. Great responses you guys. You actually got me up from in front of my computer and into dance position just to check and be sure of where my body was.