Popsugar Fitness Workouts Plank Exercises For Abs For a Leaner Belly, These 35 Plank Variations Are a Must (Plus 1 Bonus Video!) August 15, 2018 by Jenny Sugar View On One Page Photo 23 of 37 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 23 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. Be sure to perform a set on both sides. Previous Next Start Slideshow WorkoutsPlankArm ExercisesAb Exercises