Do you want ...abs? Because that's how you get abs. Combined with cardio and HIIT, ab and core training the Ab Diet will help you tone up and define your muscles. This is a short-term diet designed to get you into a better shape but it shouldn't be run for over two months. The power for kicking and punching, running acceleration and overall body strength comes from a better, stronger core. Abs are not just for show, they are your body's natural armor.