In some venues, one of the best ways to reach an audience is through humor--it breaks the ice and allows the humorist motivational speaker to wheedle his way into reticent hearts. There is no training for a humorous motivational speaker, only a natural talent for using jest to get at a serious subject.
Some of the most famous motivational speakers and most inspirational motivational speakers have used their innate humor in the most humane way--to help others find their calling or at least a sense of peace. A funny motivational speaker, as long as he always keeps intention in mind as well as entertainment, can lead an audience to understanding in a gentle manner.