ATP-PC: Very fast supply of energy, Fuel source - creatine phosphate, 10-15 seconds duration, Fatigue caused by limited supply of ATP, Power based activities, Lactic Acid: Fast supply of energy, Fuel source - Carbohydrates, 30 seconds to 2 minutes duration, Fatigue caused by lactic acid build up, Sprint endurance, Aerobic: Slow supply of energy, Fuel source - carbohydrates and fats, Unlimited duration, No cause of fatigue, Long duration activities,

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