Andy Wilemen, former assistant to John Walvoord, president of Dallas Theological Seminary tells of a leadership study. He said,
"What they discovered about leadership, is that leadership cannot be taught, but it can be learned."
Fred Lybrand (in relating this story) says that the same thing is true of extemporaneous preaching. "Delivery [on your feet] cannot be taught, but it can be learned.
I would agree with both statements.