When preparing to deliver a presentation, think about the key points you want to communicate, and say them to yourself out loud; doing so forces you to practice moving the muscles you will use when the time comes to deliver your message to your audience. You may be surprised to learn that the words you have rehearsed in silence for hours come out like responses to your dentist during a checkup when you say them for first time. A good place to practice is in the car, on the way to work; or, alternatively, on the way to the presentation venue (this has the added benefit of helping you relax) as the closed environment provides optimum acoustics to hear how your voice sounds.

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