Step 1: Start in a push-up plank position with your toes on the floor. Your hands and elbows should be stacked directly under your shoulders. Keep your core engaged and your back flat.
Step 2: Lower one arm so your forearm and elbow are resting on the ground and your arm is at a 90-degree angle. Keep your back flat while bracing your core so your body remains in a straight line.
Step 3: Bring your other arm down to the ground in the same way while squeezing your glutes and maintaining a straight body position. You should now be in the elbow plank position with your elbows aligned under your shoulders and both arms at a 90-degree angle.