For all the effort you've put into toning it—and for all the cupcakes you've given up to maintain it—your midsection should be as rock-hard as a diamond and just as much fun to show off. So why does ...

You have been doing crunches every day, hoping for those abs to finally show, but that stubborn belly fat just won't budge. If this sounds familiar, we know it sometimes gets really frustrating. The ...