Popsugar Fitness Workouts Planks With Sliders Add This Simple Piece of Exercise Equipment to Your Planks to Sculpt a Strong Core May 28, 2019 by Samantha Brodsky View On One Page Photo 2 of 6 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 2 Mountain Climbers With Sliders In a plank position with the balls of your feet on sliders, bring your right knee to the inside of your right elbow (toward your chest). Then, keeping your core engaged, return the right leg back to plank position. Repeat on the left side for one rep. Do eight to 12 reps. Previous Next Start Slideshow WorkoutsAb WorkoutsCore ExercisesPlankAb Exercises