Popsugar Health & Fitness Workouts Plank Ab Workout I Trained With J Lo's Trainer, and Now I Know the Secret Behind Her 6-Pack 21 September 2018 by Tamara Pridgett View On One Page Photo 2 of 4 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 2 Circuit One: Plank With Triceps Kickback Start in a plank position, holding a weight in each hand. Bend your left elbow and pull it up so it's in line with your shoulder. Pull your navel toward your spine to engage your abs, which will help you stay balanced. Exhale as you do a triceps kickback by extending your left hand behind you. Inhale to bend your elbow. This counts as one rep. Complete 10 reps on each arm. Previous Next Start Slideshow 15-Minute WorkoutsBodyweight WorkoutsIntermediate WorkoutsCore ExercisesAb WorkoutsCelebrity TrainersPlankStrength TrainingWorkouts