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 31 of 51 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 31 Straight-Leg Sit-Up Begin on your back with your legs straight and arms raised toward the ceiling. Roll up to sitting, focusing on the abs rounding the back. Roll back down to the mat slowly, one vertebra at a time. This completes one rep. Previous Next Start Slideshow WorkoutsAb Exercises