Popsugar Fitness Workouts Plank Exercises For Abs For a Leaner Belly, These 35 Plank Variations Are a Must (Plus 1 Bonus Video!) August 15, 2018 by Jenny Sugar View On One Page Photo 26 of 37 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 26 Arm Circle Planks In a plank position, reach your left arm back and then circle it overhead, bringing your palm back to the floor; repeat on the other side. This counts as one rep. Previous Next Start Slideshow WorkoutsPlankArm ExercisesAb Exercises