My friend Scott, who's training for the Tahoe Triple (3 marathons in 3 consecutive days... Go Scott!!) posted a great video on his blog.
Instead of stealing the idea, I direct you to his post. One of the best "feel good" videos I've seen in a very...very long time.
Check out his blog, and the link to the video here.
(It's too uplifting to pass up, and I know i'll be watching it many more times when I need a boost)