Popsugar Health & Fitness Workouts Trainer's Favourite Ab-Strengthening Exercises I'm a Trainer, and These Are My 10 Favourite Ab-Strengthening Exercises 30 September 2020 by Tamara Pridgett View On One Page Photo 6 of 10 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 more advanced people should hold for 30 seconds. Previous Next Start Slideshow Trainer TipsFitness TipsCore ExercisesStrength TrainingWorkoutsAb Exercises