Body parts puzzle

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Across
  1. 6. — Buttock muscle
  2. 7. — Shin muscle
  3. 8. — Side abdominal muscle
  4. 9. — Outer-hip muscle
  5. 11. — Chest muscle
  6. 12. — Shoulder muscle
Down
  1. 1. — Inner-thigh muscle
  2. 2. — Muscle often pulled by sprinters
  3. 3. — Arm extensors
  4. 4. — Heel-raise target
  5. 5. — Bulging lower-leg muscle, briefly
  6. 10. — Arm flexors