Improper posture includes slouching or leaning. Some presenters become overly nervous, and attempt to anchor themselves by shifting or leaning sideways. This distracts listeners from what you are saying. Do not lean on walls, tables or the podium. This appears overly casual. Your stance should also be natural and not stiff. If you appear too rigid, it will convey discomfort to your audience. When an audience senses discomfort, it takes their attention away from the message at hand.