If you take a look at the most inspirational figures in history, they're the ones who fought for something that really mattered to them. Not only did they struggle tooth and nail to win that fight, but they had a smile on their face while they were doing it.
It's that enjoyment that lets you know this person isn't gonna stop, which is scary in a good way, because it lets you know that they're enjoying the fight and they're not about a "get." They're not about reaching the finish line, so to speak.
The same could be said of competitors who don't compete for the accolades of fame or fortune. They compete for the love of the game. Like this 2-year-old biking champion who smoked his competition, but then decided at the last minute he didn't want the race to be over, so he circled back and went through the course just so he could ride some more.