Popsugar Fitness Workouts Trainer's Favorite Ab-Strengthening Exercises I'm a Trainer, and These Are My 10 Favorite Ab-Strengthening Exercises October 4, 2020 by Tamara Pridgett View On One Page Photo 6 of 11 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 6 Elbow Plank Start face down on the floor, resting on your forearms and knees. Push off the floor, raising up off your knees onto your toes and resting mainly on your elbows. Contract your abdominals to keep yourself up and prevent your butt from sticking up. Keep your back flat — don't let it droop or you'll be defeating the purpose. Picture your body as a long, straight board, or plank. Beginners should hold for 10 seconds, and those more advanced should hold for 30 seconds. Previous Next Start Slideshow Fitness TipsWorkoutsStrength TrainingCore ExercisesTrainer TipsAb Exercises