Popsugar Health & Fitness Workouts Lower Ab Exercises These Lower Ab Exercises Will Make You So Sore, It'll Hurt to Laugh! 7 March 2018 by Jenny Sugar View On One Page Photo 21 of 23 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 21 High Knees Hold your hands at waist level. Hop the right knee up toward your hands, then quickly switch legs and hop the left knee up. This counts as one rep. Previous Next Start Slideshow WorkoutsAb Exercises