Obviously Tiger was into athletics because he felt it improved his golf performance - and was probably right in doing so, considering that it was his peak period of accomplishment.

Being into athletics helps my work performance too. Athletic, fit people live longer, are healthier, have fewer sick days, and it probably extends to mental performance too, which is important in programming. Being fit also probably helps combat physical problems stemming from sitting down too much, such as back problems.

I don't see the difference. Golf is not an athletic sport, and it's plainly absurd to try to argue otherwise. There's nothing "athletic" about walking around slowly and hitting a ball with a stick; even bowling is more athletic than that. It might take some skill, sure, just like playing a musical instrument like a piano takes a lot of skill, but there's nothing athletic about playing a piano either.