Popsugar Health & Fitness Workouts How to Strengthen Your Abs Get Rock-Solid Abs With These 15 Strengthening and Toning Exercises 28 August 2018 by Tamara Pridgett View On One Page Photo 6 of 15 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 6 Birdog 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 Trainer TipsBodyweight ExercisesCore ExercisesStrength TrainingWorkoutsAb Exercises