Dedication or Obsession

People who live for dancing, are bound to be good dancers. At the very least, someone who is doing it all the time, is bound to dance better than someone who just casually moves around to music. That's why Michael Jackson chose the dancers he chose for the This Is It shows.

A football player who lives for the game, often gets drafted earlier than a football player who doesn't. Simply put, the former puts in the hours in the weight room, film room, studies the plays etc. The latter has other things to occupy him with, a family, drinks, a masters thesis. All other things being equal, the player who lives and loves the NFL with every fiber of his being is the person whom you trust the most to work his utmost for you, without distractions.

But is this kind of person dedicated, or simply obsessed? Is that passion, the thing that keeps him south of normal, stopping him from being a renaissance man?