No offense but I think a prodigy is more like a person that just *knows* how to do something. I don't really think that learning a sport at a young age is even close to prodigal levels of skill. A better example would be something like this: you throw your 3 year old in front of a computer and all of a sudden they're surfin the web, burning cd's, etc..
I'm not really one to consider sports to be a huge contribution to society. Don't get me wrong, I'm a big hockey buff. But for example, most of those players are good because their parents made them learn at a young age. You can be taught how to do anything at a younger age, it's easier to learn at that level of development.
So what i'm trying to say is that I (personally) think that a prodigy is more related to intelligence, and not skill or athletic talent. We should be pushing kids to read, learn, and explore themselves before introducing them to sports.