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. Picture your body as a long, straight board. Hold this for as long as you can. Aim for 20-30 seconds in the beginning and work your way up to one minute as you get stronger. Image Source: POPSUGAR Photography