Is it effective to work out your abs by flexing them throughout the day? - Quora

How to Get Six Pack Abs: The Ultimate Ab Workout

How to correct this 'hole' on my belly next to my abs - Quora

My abs are bulky but I want flat abs. I noticed that my side abs are very thick and it looks kinda ugly. What can I do about it? - Quora

How to Get Six Pack Abs: The Ultimate Ab Workout

I am currently at 12% body fat but still can't have visual abs. What is the problem? - Quora

What muscle do you use to flex? - Quora

When working out, is it better to hold your stomach in to workout your abs? - Quora

4 Ways to Flex Abs - wikiHow

If I can only see my abs when I flex them, what should I do differently? (pic) - Martial Arts Message Board - GameFAQs

5 Exercises to Grow Your Butt, Not Your Thighs - Oxygen Mag

Will training abs get me more definition? - Quora