Storytelling Energy

When preparing for a storytelling program, how do you prepare yourself physically to entertain your audience?
Do you drink a caffinated beverage?
Do you eat chocolate?
Do you perform breathing exercises?
I personally may drink coffee or a soda right before I present my program. I feel it gives me the extra burst of energy that I need to engage the audience attention. I have also read that eating healthy and regular exercise can help you perform at an optimum level. Look for further post on articles relating to this topic.