The thing about JD is that he doesn’t just enjoy dangerous activities, he always has to find a way to make it more extreme.
He doesn’t just ride a BMX bike, he masters back flips and immediately turns his attention to the more-dangerous front flips. He doesn’t just ride a sports bike, he takes it on curvy mountain cliffs and pushes it at amateur race days (his goal is 160 mph).
He earned the nickname “Hucker” at the BMX park because he would think of a new trick or goal, shrug, say “just huck it,” and throw the trick with little to no preparation. This is kind of the way he lives his life in general, which is both endearing and scary.