Popsugar Health & Fitness Fitness Tips Selena Gomez Ab Workout This Is Exactly How Selena Gomez's Trainer Likes to Sculpt Abs 22 April 2018 by Dominique Michelle Astorino View On One Page Photo 16 of 37 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 16 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 Fitness TipsBodyweight ExercisesCelebrity TrainersPlankWorkoutsAb ExercisesPopsugar InterviewsSelena Gomez