Popsugar Health & Fitness Workouts Trainer's Favourite Ab-Strengthening Exercises I'm a Trainer, and These Are My 10 Favourite Ab-Strengthening Exercises 30 September 2020 by Tamara Pridgett View On One Page Photo 5 of 10 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 5 Stir the Pot 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. Complete 10 reps going clockwise and 10 reps going counterclockwise. Previous Next Start Slideshow Trainer TipsFitness TipsCore ExercisesStrength TrainingWorkoutsAb Exercises