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 9 of 31 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 9 Side-Plank Crunch Begin in a side elbow plank, with your left elbow down and your right hand behind your head. Keeping your torso stable and your waist lifted, bring your right leg up toward your shoulder to lightly tap your right elbow. Lengthen your right leg back to the starting position to complete one rep. Previous Next Start Slideshow WorkoutsStrength TrainingAb Exercises