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a little thing, but try not to carry your whistle around in your hand when you are moving to report a foul or go to a spot on the floor (either put it in your mouth or let it hang on the lanyard). It helps you walk more with a purpose and look more credible if both your hands are free.
This was something a clinician pointed out to me last summer that I didn't even realize I was doing -- it was a hard habit to break.
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