It can determine the success or failure of your speech.
Although you should move during a presentation, occasionally you’ll stand still as you speak, usually during your opening and closing words or as you make an important point.
The stance you assume while standing still is important because it indicates your confidence and comfort level.
If you slouch your shoulders and fix your eyes on the floor, your audience thinks you’re shy and weak. If you repeatedly shift your weight from one foot to another, you appear uncomfortable and nervous, and your audience may be distracted by your movement.
Keep in mind: if you stand straight— feet slightly apart and your weight evenly distributed on each foot—and look directly at your listeners, you convey confidence and poise.