This isn't a book I would normally read, I'll be honest. I'm a fiend for self-help, business, and productivity advice - however I thoroughly enjoyed Scott Jurek's story of how he tackled trying to set the record for the fastest Appalachian Trail run.
I listened to the audio book, it's his and his wife's voice - and it heightened the experience without a doubt.
I'm not an ultra-runner but I found inspiration from Scott's journey of perseverance and personal transformation to chase after my own personal best.