ENERGY
When a leader speaks with energy, he/she not only gets the attention of the audience, but is also able to pass this energy down to the listeners, empowering them to act on that instruction. This is in contrast to a leader speaking in a boring manner.
Some of the best speeches in movies are delivered with such high levels of energy, such that when movie goers leave a cinema, the speech remains in their minds and it becomes a talking point. Every leader should aim for their messages to achieve the same effect when needed.
Bonus tip: A message delivered with such energy and purpose, will often leave the hair on your arms standing. Remember such speeches, rewatch them and learn how did the speaker generate such energy.
The video below is an example of a message, delivered by a leader, that it packed with energy.