Stage movement tricks
A few recommendations for moving around on stage:
Do it, some. If you're using slides, you absolutely must have a remote slide advancer. Moving around a bit on stage makes your talk more dynamic, and keeps interest. I heartily recommend the Logitech E300 (double-check model number).
Don't do it too much, it diminishes the effect.
For important points, walk toward your audience a bit (I like to go out almost into the aisle), and STOP. Hold still while you make your important point, then resume moving. This adds excellent emphasis.
When you recieve a good question, take a step or two toward your listener. This shows encouragement. If you get an antagonistic question, you can achieve the opposite effect by taking a step backwards.
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Handling nervousness