Plank

The plank (or hover) is an isolation move used in Pilates and Yoga and works the abs, back, arms and legs. The plank also targets your internal abdominal muscles.
How to Do It: Lie face down on mat with elbows resting on floor next to chest. Push your body off the floor in a pushup position with body resting on elbows or hands. Contract the abs and keep the body in a straight line from head to toes. Hold for 30-60 seconds and repeat as many times as you can. For beginners, do this move on your knees and gradually work your way up to balancing on your toes.