What image comes to mind when you think about winners? How does the person look, sound and act?
For example a loser is usually slouched over with their head down and talk very softly.
How you use your body affects your mind set. If you look like a loser you will act like a loser.
Stand up straight, stick your chest out and keep your head up and speak to the back of the room. You are going to look, act and feel like a champion.