How many speakers have you seen who have obviously watched something like this, and who robotically move their bodies in self-conscious "power poses"?

That's the point: no one likes watching a windup doll.

Rule of thumb: you can only think of ONE thing while you're up there and the adrenaline is roaring through your body. That one thing should be the content of your talk. If you get that right, the audience will forgive everything else.