Popsugar Fitness Workouts What Does Having a Strong Core Mean? A Trainer Says This Is the Biggest Difference Between a Strong Core and a 6-Pack June 10, 2019 by Tamara Pridgett View On One Page Photo 10 of 13 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 10 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 booty 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. Previous Next Start Slideshow Fitness TipsWorkoutsCore ExercisesTrainer Tips