Athletes. Nature or Nuture?

As a life time participant in sports I get to meet a lot of different athletes in a lot of different sports. I have met all kinds of people with different skill sets and body types. I've met people ranging from 6'10 285 lbs or 6'5 350lbs all the way to 5'3 105 lbs and it made me wonder are athletes born or raised? There is obviously a physical aspect involved when it comes your body type but is that all that matters? there have been many small or otherwise "undersized" people that have gone on to become Great athletes even when people told them they couldn't. So perhaps it is the way the people are raised. Having someone to lead by example and push you to reach your potential can make all the difference. Personally I think the combination of genetics and upbringing are the main differences make in creating athletes. Regardless of height weight or body type I believe it is possible for anyone to become a great athlete as long as they have the will and determination to do so.