ATP-PC Energy System, Site of Reaction: Sarcoplasm, Enzyme: Creatine Kinase, Fuel: Creatine Phosphate, Duration: 2-10 seconds, Recovery: 3 Minute, Energy Yield: 1ATP, LACTIC ACID Energy System, Site of Reaction: SARCOPLASM, Enzyme: PFK & LDH, Fuel: Glucose or Glycogen, Duration: 10 seconds - 3 minutes, Recovery: 1-2 hours, Energy Yield: 2-3 ATP, AEROBIC Energy System, Site of Reaction: Mitochondria, Enzyme: PFK & Lipase, Fuel: Glucose, Glycogen and/or Fat, Duration: 3 minutes- Hours, Recovery: 24 Hours, Energy Yield: 38ATP or 129ATP

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