Begin in a high plank position with your hands slightly wider than shoulder-width apart (since we are targeting your back).
Brace your core by drawing your navel in toward your spine.
Keeping your back flat, begin to lower your body toward the floor until your chin almost touches it. Remember to look down toward the floor between your hands to keep a neutral spine, and don't let your elbows flare out. Keep them close to your sides.
With your core still engaged, begin pushing up, back into starting position.