He is no doubt a very talented person, and can perform stunts that many of us cannot (and should not) do. However, I find his videos to be extremely motivating. Not in the fact that I want to go jump off the side of a building, but motivation to know just some of the things the human body is capable of!
More on Damien from wiki:
Walters participated in four Trampoline World Championships. In 2003 he was one of four members of the British team winning the World Title in the team competition. In the years 2001 and 2007 he ranked 4th with the team. He also finished 5th in singles competition in 2003 and 2005. In addition he won the European Title with the British team in 2006, just after he was placed 2nd in team and 8th in the singles competition two years earlier.
Since 2007 Walters has not participated in further tournaments and has focused on his other projects, mainly his career as a stuntman. He also appeared, however, in a number of television commercials and has performed in acrobatic shows. Walters has had the role of stunt double or stunt performer in the films: Hellboy II: The Golden Army, Ninja Assassin, Scott Pilgrim vs. the World, The Eagle, Steven Spielberg's I Am Number Four, Blitz, Colombiana, and Captain America: The First Avenger. In Kick-Ass, he was credited as both a stunt double and assistant fight coordinator. He will also appear in the films Sherlock Holmes: A Game of Shadows and 47 Ronin.