Popsugar Health & Fitness Workouts Best Exercises For Strong Abs I'm a CrossFitter, and These Are the 20 Core-Carving Exercises I'm Obsessed With 28 November 2018 by Jenny Sugar View On One Page Photo 4 of 20 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 4 Crunchy Frog Begin sitting, balanced just behind your sits bones, and rock back slightly to lift your feet off the floor; gently pull your knees to your chest. Exhale, pull your navel to your spine, and lean back slightly as you open your arms to the sides and straighten your legs. Inhale and return to the starting position to complete one rep. Previous Next Start Slideshow WorkoutsAb Exercises