Don't have to: You have to really work incredibly hard not to. Even with very rigorous exercise though, if you have some curvature in your low back, no exercise in the world is going to make your abdomen look flat.
Answered 5/17/2012
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4 doctors weighed in across 2 answers
A doctor has provided 1 answer
A doctor has provided 1 answer
A doctor has provided 1 answer
A doctor has provided 1 answer
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