What happens when you flex your arm?

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Tags

  1. #contracting
  2. #effect
  3. #bending
  4. #tense
  5. #contract
  6. #triceps
  7. #bulge
  8. #position
  9. #biceps
  10. #opposite
  11. #still
  12. #while
  13. #example
  14. #muscle
  15. #keeping