The Only Ab Exercise You'll Ever Need

In my brand-new Eat This, Not That! For Abs book, there's a scientifically proven diet system and an incredible six-week program to strip away belly fat and unveil lean, hard abs—for life. But if I had to pick the number one ab exercise—the only move you'd ever need to get and keep a six pack—it's this one. Take a look to find out what it is and how to do it!