The Air of Confidence
Think about the "Austrian Oak," California Governor Arnold Schwarzenegger. He has an air of confidence. Regardless of the events surrounding him or the criticism he may be facing by any particular group, he conveys a look of being in control. You won't see him wringing his hands, shuffling back and forth, jiggling coins in his pocket, or rubbing his hands repeatedly through his hair. He comes across as someone who won't cower, waffle, or retreat.
What to do: Pay attention to small, potentially distracting body movements, like tapping your toes or fidgeting with your fingers, pens, or coins -- all signs of nervous energy. Look and sound more engaged by channeling that energy into face, voice, and hand gestures.