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I'm kinda chubby but I have a 4 pack, how do I get a 6 pack?

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ok,well the title pretty much says it all, but what it really is is when I tense my stomach the top and the middle section goes hard, but the bottom bit at the bottomof my stomach doesn't. I did 50 sit ups a night, but now I've bumped it up to 100. what exersizes can I do to increase the muscle in my lower stomach? cheers.