After two decades of dominance, triathlete Courtney Atkinson takes on the IRONMAN competition, while freerunner Ryan Doyle pushes himself to defy rules and limitations.
Pro skateboarder Ryan Sheckler copes with the downside of fame by launching a foundation to help others, while aerobatic pilot Hannes Arch embraces a more balanced and measured approach to his sport.
Rock climber Sasha DiGiulian and hang glider Jon Durand may not have much in common on the surface, but they both understand that they can be their own strongest competitor.
Big wave surfer Mark Mathews creates a boundary-pushing surf event, while Scotland's Danny MacAskill uses cameras, computers and YouTube to popularise street trial riding.
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