World Champion Craig Valentine suggests you become aware of when the audience is "with you," when things are going well onstage, the audience is laughing or deeply involved or something that shows that they are "getting it." When this happens, step away from your prepared words and find ways to draw out that point: use more examples, uncover humor in the situation, or do something else that makes the moment last.
Lastingly,
Tim Wilson
Professional Speech Coach
Free speaking tips at: http://speakingquicktips.blogspot.com