Popsugar Fitness Workouts 3-Minute Plank Workout Tone Your Arms and Core With This 3-Minute Plank Workout January 9, 2016 by Jenny Sugar View On One Page Photo 4 of 5 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 4 Plank With Creepy Crawler Come into plank position. Bring your right knee to your right elbow, and then return the right leg back to plank position. Repeat this action on the left side to complete one rep. Continue alternating for as many reps as you can for 30 seconds. Previous Next Start Slideshow WorkoutsStrength TrainingBodyweight WorkoutsAb WorkoutsBeginner Workouts5-Minute WorkoutsArm Workouts