The scientific information presented in the first three sections on the onset of fatigue during exercise (Part 1 Fatigue–Energetics, Part 2 Fatigue–Anaerobic Alactic Energy System, and Part 3 Fatigue–Anaerobic Glycolytic Energy System) pointed out the importance of beginning each discussion on energy system metabolism with basic review of adenosine triphosphate (ATP) and its role in…