I see athleticism as being spectrum, rather than just something you are or you aren't. I'd say the ones that aren't athletes are the ones that are just sitting on the couch, pissing their lives away. On the opposite end of the spectrum, lie the people that are both physiologically gifted and who put in the work. The rest of us are scattered in between.

In my own case, I do have some things that are beneficial for cycling performance(lung volume, hip mobility, femur length,) yet I also have an over-built musculoskeletal system that that would be more beneficial for a contact sport. Despite having a build that would be great for many stick and ball sports, my poor coordination means that I've pretty much sucked at every conventional sport I've tried. Get me on a MTB in technical terrain, I feel poised...put me on a basketball court and I have the foot work of a baby deer.