There's a common misconception that the three energy systems of the body function like a set of light bulbs, switching from one to the other as the duration of exercise gets longer. Current research shows, however, that the ATP-PC, Lactic and Aerobic systems are used together for almost all physical activity. This program clearly explains how. With the aid of clear, animated diagrams and comments from experts like Peter LeRossignol, this program explains: - Anaerobic and aerobic glycolysis - How myosin and actin use ATP to contract muscles. - Oxygen uptake and oxygen deficit. - The interplay of the three energy systems. - Chronic and acute training effects. This program also has regular breaks for note-taking and discussion to ensure students can grasp this complex topic.