Popsugar Fitness Workouts 100-Rep Crunch Workout The It'll-Hurt-to-Laugh-Tomorrow 100-Rep Crunch Workout January 20, 2018 by Jenny Sugar View On One Page Photo 4 of 6 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 4 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. Perform 10 reps. Previous Next Start Slideshow WorkoutsStrength TrainingBeginner Workouts10-Minute WorkoutsIntermediate WorkoutsAb Exercises