When you have the opportunity, before you present, go or a walk on your own, this will help you clear your mind so you can concentrate on the presentation and the exercise will also help your body handle the flow of adrenalin.
In general, taking some exercise half an hour or so before a presentation will prepare your body for the event. It will make you will feel more energetic and this will come across to your audience.
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Posted by Graham Young 
Graham Young
A to Z of Business Presentations 