fitness crossword puzzle

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Across
  1. 2. 1 min of pushups, hold the plank
  2. 8. working more often and harder
  3. 9. running, swimming, biking
  4. 12. how hard
Down
  1. 1. stretching, yoga
  2. 3. how often
  3. 4. bones, muscles, tendons
  4. 5. making you work out more challenging
  5. 6. weight lifting, bench press, pull-ups
  6. 7. how long
  7. 10. an exercise to increase your heart rate
  8. 11. which exercise