Fellow speaker,
Robert Cialdini writer of the book "Influence" says that there is a Law of Consistency: people who publicly say they are going to do something will do that thing because they don't want to go against their word. For this reason, getting your audience to publicly declare something is powerfully motivational. For example, "Raise your hand if you want a better life, more money, more happiness, and are going to change your ways based on what you heard here tonight!"
Motivating,
Tim
