Alberto's crossword

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Across
  1. 4. substance that acumulates in the muscle during exercise and make it difficult to continue
  2. 8. cooperation between classmates
  3. 9. fluid that lubes the joints so that the movement is smoother
  4. 10. place where we exercise and work out
  5. 12. object to play volleyball
  6. 13. stuff you can use to make yourself stronger
  7. 14. muscle fibers which are better for endurance training
Down
  1. 1. sport in which you use your own feet
  2. 2. small air sacs where the oxygen and co2 exchange happens
  3. 3. exercise to make the abs strongers
  4. 5. place where you can run outdoor
  5. 6. place where we play games
  6. 7. sport in which you play with a racket and a ball
  7. 11. muscle fibers that are explosive and give you a burst of energy