HOW: Start with your hands on the ground directly underneath your shoulders in a push up position. Your toes should be pushing into the ground with your knees straight and a little less than shoulder width apart. From this position, drive one knee up to your chest and bring it back as you do the same to the other side. Maintain a flat back as you alternate your knees coming up. Think of it as performing high knee running in a plank position.
FEEL: You should feel your core and hip muscles working.
COMPENSATION: Keep your back flat, don’t arch it. Keep your elbows straight and stay strong in your shoulders for stability.