Popsugar Fitness Workouts How to Strengthen Your Abs Skip the Crunches and Strengthen Your Abs With These 15 Exercises December 10, 2018 by Tamara Pridgett View On One Page Photo 2 of 16 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 2 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 WorkoutsStrength TrainingBodyweight ExercisesCore ExercisesTrainer TipsAb Exercises