I've missed more than 9000 shots in my career. I've lost almost 300 games. 26 times, I've been trusted to take the game winning shot and missed. I've failed over and over and over again in my life. And that is why I succeed.
I'd have to say the whole experience in making The Neverending Story. I had an incredible time.
If you're asking your kids to exercise, then you better do it, too. Practice what you preach.