I'm posting a QandA about Until It Hurts and some of the thinking that went into the book. The article appears at Sportsletter.org.
David Davis, who conducted the interview, posed some interesting questions from 'What do you think is the lesson of Tiger Woods' story?" to "In the book, you write about being your son's baseball coach and having him pitch in a game when he had tendonitis. Why did you have him pitch while he was hurt?" (Well, because it was playoff time?).
It's a very good overview of the book.