(Bk Business) Carol Kinsey Goman Ph.D.-The Nonverbal Advantage_ Secrets and Science of Body Language at Work -Berrett-Koehler Publishers (2008)

Chapter 10: Selling Your Message without Saying a Word
169
“Before I begin, let me apologize for
my appearance; apparently there’s
a full moon this evening.”
I don’t mean that your words don’t matter. Obviously,
if you want people to be convinced, emotionally touched,
or motivated to action, you will need to have relevant and
meaningful content when you address them. But because
body language sets up the initial perception, you’ll also
need the following do’s and don’ts to gain the nonverbal
advantage.
Do get out and let the audience see your whole body.
Don’t hide behind the lectern.
Do stand centered on both feet (about shoulder width
apart) with your knees slightly bent.
Don’t rock backward and forward or shift your weight
from foot to foot. You will appear distracted or unsure
of yourself.
Do open your body. Keep your shoulders back and your
upper body relaxed. Always show your hands and use
open-palm gestures.