Popsugar Health & Fitness Arm Exercises Arm and Ab Exercises Here's Your Exercise Encyclopedia For Toned Arms and Tight Abs 1 June 2018 by Susi May View On One Page Photo 16 of 25 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 16 Feet on Medicine Ball Push-Up Begin in plank position with you toes resting on a medicine ball. Keeping the core engaged, bend and straighten your arms to complete a push-up. Adding the instability of the medicine ball forces your abs to work overtime in this push-up variation. Previous Next Start Slideshow Arm ExercisesWorkoutsAb Exercises