Popsugar Health & Fitness Plank What Are the Best Side Plank Variations? If You Want to Slim Your Waist, These Are the 13 Best Side Plank Variations 14 March 2018 by Jenny Sugar View On One Page Photo 11 of 13 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 11 Star Plank Come into a side plank on the right side. Flex both feet and lift your left arm straight in the air. Keeping your spine lengthened and your abs engaged, lift your left leg up as high as you can without letting your waist sink to the ground. Then slowly lower your right leg back to the starting position to complete the rep. Previous Next Start Slideshow PlankArm ExercisesWorkoutsAb Exercises