Popsugar Health & Fitness Workouts What Are the Best Ab Moves? The 50 Best Moves to Strengthen and Chisel Your Core (Plus a Bonus 10-Minute Workout Video!) 14 September 2018 by Jenny Sugar View On One Page Photo 25 of 51 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 25 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