[Assess students' understanding of how the ATP–PCr, glycolytic (anaerobic glycolysis), and oxidative (aerobic) systems contribute across a range of exercise intensities and durations; include mechanisms (rate vs. capacity), metabolic markers (lactate, VO2 kinetics, PCr depletion), transitions in system dominance over time, effects on fatigue and recovery, and application to training design choices such as interval length, work:rest ratios, specificity, and periodization.]