Popsugar Fitness Workouts Quick Yoga Ab Workout A Quickie 4-Minute Yoga Ab Workout October 20, 2014 by Jenny Sugar View On One Page Photo 2 of 6 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 2 Knee Up Plank Come back to a plank position. Draw your right knee into your chest, holding for five deep breaths. Step the right foot back and switch sides, bringing the left knee into the chest for another 30 seconds. Source: Louisa Larson Photography Previous Next Start Slideshow WorkoutsStrength TrainingYogaAb Exercises