James "Bubba" Stewart has just finished watching videotape of himself launching three stories into the air on a motorcycle. "I'm a nut, dude," he said after one series of ludicrous jumps. "See, that's ...

Big motocross jumps are already insane. But what if you tether a bunch together, and then jump gaps over open water? Easy, you get a Red Bull video. One dirt biking skill I very much lack is the art ...