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 8 of 11 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 8 Spiderman Plank (aka Creepy Crawler) In plank, open your knee to the side and bring your knee to your elbow and alternate sides. To modify, just lift leg open to the side. Previous Next Start Slideshow WorkoutsStrength TrainingBodyweight WorkoutsAb WorkoutsPlankBeginner WorkoutsIntermediate WorkoutsBack WorkoutsArm Workouts20-Minute Workouts