I was having a discussion with my son last weekend and he informed me that I'm an endurance athlete. Now, as far as I'm concerned, I'm just a bike commuter with a pretty reasonable ride, but he said that the fact I spent around 3.5 hours/day, 5 days/week riding makes me an endurance athlete. I tried checking around, but couldn't find any kind of a definition that seemed applicable.

So what do you guys think? What makes someone an athlete or an endurance athlete? Inquiring minds and all that...