Popsugar Health & Fitness Workouts How to Strengthen Your Abs Get Rock-Solid Abs With These 15 Strengthening and Toning Exercises 28 August 2018 by Tamara Pridgett View On One Page Photo 11 of 15 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 11 Reverse Crunch Lying on your back, lift your legs in the air with your knees bent. Place your hands on the floor beside you. Without momentum, use your lower abs to slowly curl the hips off the floor and into your chest. Slowly lower them back to the starting position. This counts as one rep. Previous Next Start Slideshow Trainer TipsBodyweight ExercisesCore ExercisesStrength TrainingWorkoutsAb Exercises