mental gymnastics

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Across
  1. 2. these...require a lot of training
  2. 4. took the...medal
  3. 5. to...with complex problems
  4. 6. international...olympiad
  5. 8. knows...how
Down
  1. 1. to...his native country
  2. 3. a...sport, such as ice-climbing
  3. 7. he...a silver medal