1. AEROBIC SYSTEM: Long duration (10+ minutes), Low intensity, Energy source is oxygen, Examples: Long distance running, walking, 2. ANAEROBIC LACTIC ACID: Short duration (30 - 90 seconds), Medium - high intensity, Energy source is carbohydrates, Examples: Rugby maul, netball game, weights session, 3. ATP - CP: Very short duration (10 - 20 seconds), High intensity, Energy source is creatine phosphate, Examples: 100m run, shot put throw, tennis serve,

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