This is a video that appears on NikeRunning.com. In it, Kara briefly talks about how they toughed it out through the down times in their careers, times where many would have just stepped aside.

Here’s an article by Neil Davidson that appeared in The Brooks Bulletin.
It involves the UFC fights and how obvious mental toughness can be. Here’s a quote from the article by UFC president Dana White:
“This kid was so nervous to fight Matt Serra, it was blowing my mind. I think that Georges St. Pierre needs […]

Here’s an article by Marvin Zauderer that appeared in Pez Cycling News on managing emotions.