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Originally Posted by Scrapper1
I wouldn't actually blow the whistle in a small room, anyway. Not good for the ears. Just say "Tweet" or something similar to simulate the whistle, and then make the appropriate signals in the mirror. It really helps a lot.
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Or if you're really feeling sadistic, you can use a dog whistle for your practice. 
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"It is not enough to do your best; you must know what to do, and then do your best." - W. Edwards Deming
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