Fitness crossword puzzle

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Across
  1. 2. Broken bone
  2. 4. F.I.T.T
  3. 5. ability to move quickly and easily
  4. 7. gains and improvement
  5. 11. absence of free oxygen
  6. 12. Reduces chance of injury
Down
  1. 1. a joint overextends
  2. 3. failure of the body's warming system
  3. 6. freezing of the skin
  4. 8. frequency and intensity
  5. 9. movements to raise heart rate
  6. 10. injured tissue or skin