Hi, I thought you may like this Mentalrobics exercise from Braingle.com:
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Use it or Lose it

Previously, we learned how natural brain deterioration [ For more on 'brain deterioration' go here: http://www.braingle.com/mind/318.html ] is mostly caused because of disuse. If a neural pathway is not activated from time to time, it will slowly diminish in strength until the memory is no longer recoverable. Having a rigid daily routine is a sure way to make sure your brain doesn't have to think very much. To keep your memory intact, make sure that you use it on a daily basis. Vary your routines [ For more on 'routines' go here: http://www.braingle.com/mind/335.html ], do the crossword, or try memory games to keep your brain active.
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For more mind exercises: http://www.braingle.com/mind/