Those Trials riders have better balance on a bad day than I have ever had.....
I had a fellow working for me a number of years ago that was a Trials rider. He would hone his balance skills on a tight rope in his back yard. Not really high up like a daredevil might, but high enough to make him go back to the beginning or end and start over again.
He said that the walking was the easy part, but managing his load (two pails of water on a shoulder stick) while turning around was the real hat trick..
These guys and the X-Games contestants just amaze the heck out of me....