Research from the University of Wisconsin–La Crosse shows that the crunch activates the rectus abdominis and external obliques better than any other common core exercise. But that's granted you know how to do crunches the right way. "People think crunches
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Flatten your belly, burn fat and strengthen your core with these killer tummy toning exercises. This flat abs workout routine for women combines cardio and strength training moves to boost your metabo (Fitness Motivation For Women)