Popsugar Health & Fitness Workouts What Are the Best Ab Exercises? These Are the 40 Most Effective Ab Exercises to Sculpt Your 6-Pack 20 June 2018 by Jenny Sugar View On One Page Photo 25 of 41 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 25 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