If extreme activities (and I don't mean the Hollywood ones like UFC & X-Games) and the people who pursue them interest you then seek this doc out.
This is one of those truth-is-stranger-than-fiction tales of Donald Crowhurts's obsession to prove himself against great odds. Those odds were stacked by Mother Nature, the media and his own mind. It is also about a time lost to us --although it was only 40 years ago.
The filmmakers have done a great job in gathering a wide range of material to tell his story and the story of the great race that consumed him.
I couldn't help but to think about Timothy Treadwell and the Apollo astronauts in the 2 great docs GRIZZLY MAN and IN THE SHADOW OF THE MOON while experiencing --you don't simply "watch"-- this story.
If you live in a big city buy it or rent it. It is worth the effort to find. I had to travel 100 miles to L.A. to buy it and I am glad I did.