Popsugar Health & Fitness Workouts What Does Having a Strong Core Mean? Just Because You Have a 6-Pack Doesn't Mean You Have a Strong Core — Here's Why 15 May 2019 by Tamara Pridgett View On One Page Photo 5 of 13 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 5 Circling Plank Begin in an elbow plank with your forearms resting on the top of a ball. Keeping your core strong and your body still, use your arms to roll the ball in a small clockwise circle. This completes one rep. Previous Next Start Slideshow Trainer TipsFitness TipsCore ExercisesWorkouts