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Across 3. Your muscles get filled with this to make them tired. 6. You can stretch your muscles without injury 9. Repeatably applying force over a long period of time 12. When exerting a force in a short, fast burst 14. Lactic acid builds up and Your muscles feel very tired 15. Your muscles don't get tired quickly

Down 1. Your muscles get enough oxygen to work effectively 2. When you try to move an immovable object or a heavy object 4. You have the right percentage of fat versus muscle. 5. You can lift, carry and throw objects. 7. Your body does this to cool you down 8. Exercise where your heart rate gets up and your breathing gets up over a sustained period of time 10. How long can it take for your body to replenish energy levels 11. Strong movements performed with speed 13. You can run quickly