Learning public speaking is like learning to ride a bike. All you need is some initial courage and a sense of balance. Then you have to change gear as appropriate. Once you’ve progressed that far you simply learn when to put on the brakes.
Most of us have suffered from listening to poor public speakers. We’ve squirmed as they’ve gone on endlessly saying the same thing in a dozen boring ways. Most of us too have admired brilliant speakers and wished we too could captivate an audience. At the very least most of us would like to express our views in public without losing our courage not to mention our voices.
The thing most public speakers have in common is simply a fear of making fools of themselves. They may be college students who have to study rhetoric as part of their schooling. In adult life those who attend may be budding politicians, trade union activists or aspiring business people. There may also usually be a few shy singles and some married couples sharing a new experience in communications. However interesting the mix they don’t usually expect to start the class with breathing exercises.