Popsugar Fitness Workouts Standing Ab Workout This 4-Move Ab Workout Is the Key to a Stronger Core — All You Need Is 10 Minutes February 6, 2019 by Tamara Pridgett View On One Page Photo 2 of 4 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. Complete 15 reps. Previous Next Start Slideshow WorkoutsStrength TrainingAb WorkoutsCore ExercisesTrainer TipsGIF Exercises10-Minute WorkoutsIntermediate Workouts