On August 4, 2006, at X Games 12 [wiki] in Los Angeles, Travis Pastrana [wiki] became the first rider to land a double backflip in competition.
Hit the Play button or follow the link to Youtube video to watch the jump.
Link - via Contagious News
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Oh, and underwater. They need to add syncro swimming to the x-games. Maybe syncro swimming on motorcycles. Now THAT'S extreme.
In all seriousness though, that was pretty cool.