Popsugar Fitness Workouts Plank Challenge Workout Take the Plank Challenge to Carve Your Core June 23, 2018 by Susi May View On One Page Photo 6 of 11 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 6 Elbow Plank With Side Step Start in an elbow plank and alternate stepping your legs to the side keeping your toes off the floor. To modify, tap your toes to the floor. Previous Next Start Slideshow WorkoutsStrength TrainingBodyweight WorkoutsAb WorkoutsPlankBeginner WorkoutsIntermediate WorkoutsBack WorkoutsArm Workouts20-Minute Workouts