Popsugar Health & Fitness Core Exercises 19 Best Ab Exercises That Aren't Planks Spare Your Arms: Light Up Your Abs With 19 Core Moves That Require No Planking 28 February 2020 by Maggie Ryan View On One Page Photo 19 of 19 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 19 Bird Dog Get on all fours, with your knees under your hips and your hands under your shoulders. Remember to keep abs engaged and keep your back flat. Reach out with your right hand and extend your left leg out behind you. Round your back and head to connect your right elbow with your left leg under your body. This completes one rep. Previous Next Start Slideshow Core ExercisesWorkoutsAb Exercises