Hi, I thought you may like this Mentalrobics exercise from Braingle.com:
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Change of Scenery

If your mind is feeling particularly stuffy, go for a short walk. Mild exercise helps gets your blood flowing and gives your mind a little more energy. It's easy for the mind to get stuck on one thought and be unable to let it go. Getting outside in the fresh air will help flush out your mind and get you into a creative mindset.
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For more mind exercises: http://www.braingle.com/mind/