Popsugar Fitness Workouts Four-Minute Ab Workout This Ab-Strengthening Plank Workout Is 100% Hard but 100% Good — Here's How to Do It May 28, 2019 by Tamara Pridgett View On One Page Photo 4 of 4 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 4 Previous Next Start Slideshow WorkoutsStrength TrainingBodyweight ExercisesAb WorkoutsCore ExercisesBeginner Workouts5-Minute WorkoutsAb Exercises