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 4 of 23 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 4 Double Crunch Lie on your back on the floor, raising your arms and legs to a 90-degree angle. Engage your abs to lift both your shoulders and pelvis off the ground. Touch your fingers to your toes. Keeping your core engaged the entire time, slowly lower them back to the starting position to complete one rep. Previous Next Start Slideshow WorkoutsAb Exercises