If I can feel my rib cage, does it mean I have underdeveloped abs? - Quora

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What are some tips to get nice abs? - Quora

Can I contract my abdominal muscles voluntarily to have a flat

How long did it take you to get abs? - Quora

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Why do I have pain under my left rib cage after eating? - Quora

Is an ab wheel more effective in getting a six pack than sit ups

Why do some people's ribs show? - Quora