The non-verbal language is responsible for ninety percent of our impression of a person. Let's give you a simple example. The speaker doesn't mean what he or she says. The audience may not form this impression consciously, but the non-verbal language impresses on a very primal level. So, be assured, the speaker has shot himself in the foot and he will have to go far in the non-verbal to undo the damage he has done in the first two seconds of his presentation.
Many speakers never recover.
But first, you must know something about non-verbal language. You can't do a drill in French unless you speak a little French. Of course the exciting thing about the non-verbal language is that everyone is already speaking it. It's just that few speak it well. And that's what we train you do do.