They created this routine in less than a week and actually won the competition.
The gayageum or kayagum is a traditional Korean zither-like string instrument, with 12 strings.
“The Walters and Shieff show is about a world famous stunt man and a freerunner coming together, showing us their combined disciplines and getting creative in an adult playground!”
Don’t know if the guy has some particular condition (Parkinson?), but he sure is really into it anyway