Recently, I listened to Chris Hauth on the Rich Roll podcast episode 297 (he is also on episode 21 and 256) which can be found here:
http://www.richroll.com/category/podcast/ (it's called Coach's Corner).
Chris Hauth was and Olympic swimmer and iron man champion who trains endurance athletes. He trained and trains Rich Roll.
Chris has his own podcast which has great advice for endurance athletes. His podcast can be found here:
http://www.aimpcoaching.com/series/the-weekly-word/
If you train for endurance, you will find these podcasts inspirational.