Wellness Fitness Move of the Week: On-the-Ball Plank Tighten your core with this slimming ab exercise. The On-the-Ball Plank moves uses a stability ball and can be done just about anywhere. By Ashley Macha Updated on December 18, 2019 Share Tweet Pin Email Tighten your core with this slimming ab exercise. The On-the-Ball Plank moves uses a stability ball and can be done just about anywhere. Planks are popular on-the-ground ab moves for a reason (they work!). Adding the stability ball forces you to keep your body balanced and flexed, adding a level of difficulty to the traditional plank. To make it even harder, do 5 pushups in between each plank, which will work your arms, shoulders, back, and core. How to do it: Place your shins and tops of your feet on a stability ball with your hands on the ground in plank position (shown). Engage your core, squeeze your butt muscles, and hold for 1 minute. Try this exercise: On-the-Ball Plank Read more: The Joy Workout The Best Gadgets to Make You Slim The Perfect No-Gym Workout Was this page helpful? Thanks for your feedback! Tell us why! Other Submit