This high-energy workout challenges the beginner and advanced athlete alike. Build stamina, improve coordination and flexibility, and burn calories as you build lean muscle with this fun and challenging workout. Cardio exercise is executed at your own level. It is up to you to exercise responsibly. See your doctor if you are uncertain where your heart rate level should be while executing cardio exercise. Wear comfortable clothing and cross training closed toe shoes, or shoes with good soles and support.