Popsugar Health & Fitness Workouts What Is the Correct Position For a Plank? I'm a Trainer, and Here's Exactly How to Perfect Your Plank If You Want Stronger Abs 25 April 2019 by Tamara Pridgett View On One Page Photo 2 of 11 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 2 Plank With Clamshell Lie on your left side with knees slightly bent and your elbow underneath your shoulder. Press into your bottom forearm to lift the hips as high as possible, keeping your abs engaged. Raise your top knee to open the thighs like butterfly wings, then slowly lower the knee, completing one rep. The move is similar to the clam. Previous Next Start Slideshow Trainer TipsBody WeightFitness TipsBodyweight ExercisesInjury PreventionPlankStrength TrainingWorkoutsAb Exercises