Speakers can reduce such nervousness by selecting topics they either love, know something about, or show interest in learning more about. This automatically reduces the severity for nervousness because it reframes the presentation. The freedom of choosing a topic means the speaker no longer has to view the speech as a chore or a burden, but an opportunity to share information he or she deems important with others. The act of learning can often imbue such excitement, providing an opportunity to discover fresh, unique, and innovative information to present to others.
Imagine having to deliver a presentation on a topic you know virtually nothing about; such a scenario probably ranks up there with having to give a speech in your underwear.