Upper class upbringing in Canada with luxuries that most of us can only dream of. Of course, his work ethic and motivation has something to do with it, but for athletes, that is a given.
What's given him the upper hand is his privilege.
While most fighters are training with regular bags, tires, sledge hammers, ropes, and some not being able to eat daily, GSP uses sophisticated advanced technology that others can't afford. Thus, giving him an advantage.
You can almost say money is what bought his title as money usually does. Well, the exception to that would be the Dodgers. All the money in the world couldn't help that sorry ass team.