I happened upon the TV show "Ninja Warrior" on the channel G4. The show, imported from Japan, is a reality competition of top (mostly Japanese) athletes trying to complete obstacle courses.
It's a fantastic show!
There are four stages of competition. One hundred start the first stage. In two of the four tournaments I have seen so far, NO ONE has made it to the fourth stage. The show just ends with no winner. Imagine a United States show like "Survivor" doing that.
My favorite competitors right now are Shingo Yamamoto and action star Kane Kosugi.
Here is Shingo trying to conquer the final stage.
Here is one of the few YouTube videos of Kane competing that I could find.