indefatigable in-dih-FAT-ih-guh-bul, adjective:
Incapable of being fatigued; not readily exhausted; untiring; unwearying; not yielding to fatigue.
Warning: You might want to watch the clip on mute. Whoever put it together decided to use "Eye of the Tiger" for the background music. Because a highlight clip for an Alabama player should obviously use music played by Auburn.