I have read a lot of sports books in my life, but none was more influential than Ultramarathon Man.
The story revolves around Dean Karnazes, your typical office guy soul searching as he approached his 30s. During his birthday, he found his calling by running all night long.
The book then covered all of his adventures as he ran from different cities and forrests to the coldest mountains and the hottest deserts.
Underlying in his extreme adventures is his will and passion not to give up when times get tough. And that has influenced me a lot as a runner.