Larry Linkogle was a child-prodigy motocross racer who turned pro at age 15. A daredevil and rebel from the start, he quit the sport in spectacular fashion during a major national event and went home to create a new extreme sport -- Freestyle Motocross (FMX) -- marked by high-flying stunts and death-defying action. From there, the ride just got wilder. On a lark, he and a friend created The Metal Mulisha -- now a top brand in FMX -- and he...