ATP/PC System: No Oxygen Required , Very fast energy supply, Fuel source = creatine phosphate , ATP production Limited, No By Products , Duration = 0-10 seconds, Activity - Power based activities (100m), Anaerobic Glycolysis System: No Oxygen required , Fast energy supply , Fuel source = carbohydrates , Limited ATP production, Lactic acid is the by product , Duration = up to 2 minutes , Activity - sprint endurance (400m), Aerobic System: Oxygen is required , Slow energy supply , Fuel source = carbohydrates & fats , Unlimited amount of ATP production, By products - CO2, H20 & Heat , Duration - forever , Activity - long duration (marathon),

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