They are people addicted to adrenaline that do not get bored so easily practice this type of extreme sports is their passion, but also the slightest mistake and can be crippled or lose their lives what I have always liked about this type of sports is how easy they make it look, but in reality it is very complex are totally masters, but no one sees the blows the broken bones and falls the blood that often spilled to do what they do.
If someone has worked hard to find continual improvement it's probably easy to look from the outside and think, that looks easy, but it rarely is and often comes down to a lot of hard work like you say.