Popsugar Fitness Workouts Waist Exercises Here's How to Work and Tone Your Waist May 10, 2019 by Susi May View On One Page Photo 15 of 31 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 15 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 keeping your foot on the floor. Previous Next Start Slideshow WorkoutsStrength TrainingAb Exercises