Help w/ definition!!!!

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I have been working out for a while, and using MFP. I have had great results, and my wife says I look great. One problem! I want to get some real definition in my mid section. I know that this is the last place the fat goes from. Can anyone give me some tips on how to get my abs to show. I can see them wanting to come out, but not quite there yet. LOL HELP!