I used to think that genetics was only a small part of the equation until my best friend Jeff had his first son. Jeff is by far the most gifted non-proffesional athlete I've ever seen. He is a scratch golfer, at one time he was ranked in the top 100 in CA in tennis and 2 in the nation in singles raquet ball and 1st in the nation in doubles raquet ball....all at the same time. He would go out on our training rides and spank the cat1 guys on any climb or any sprint. Jeffs wife is also very athletic and very very good cyclist.
The first son Daulton is now 10. He isn't the tallest kid around but he can touch the rim allready. He plays DB against kids who out weigh him and are taller and usally gets the best of them. He can throw a baseball like a kid 5 years his senior. The next son Luke is even more talented than Daulton. These kids didn't just learn to play sports well they inherited it from their parents.