MAN IN THE ARENA | Elon Musk - YouTube
Narrated by Lex Friedman (AI researcher working on autonomous vehicles, human-robot interaction, and machine learning at MIT and beyond)
Playing Guitar in a Self-Driving Car - YouTube
Man in the Arena Speech by Theodore Roosevelt with Audio, Read by John F. Kennedy - YouTube
Citizenship in a Republic - Wikipedia
Citizenship in a Republic is the title of a speech given by Theodore Roosevelt, former President of the United States, at the Sorbonne in Paris, France, on April 23, 1910.
One notable passage from the speech is referred to as "The Man in the Arena":
Someone who is heavily involved in a situation that requires courage, skill, or tenacity (as opposed to someone sitting on the sidelines and watching), is sometimes referred to as "the man in the arena".
Citizenship in a Republic: The Man in the Arena - Theodore Roosevelt @ LeadershipNow