What is the biological reasons some people are so good at sports?

I was in my high school womens basketball team. That's an interesting question. I was and still am really really competitive. For me it was just about being the best or being on the best team. I loved winning. I guess you just have to have a competitive side to you and focus on the win. That's how i see it. This way, you do everything in your power to win and as a result you subconsciously make the right moves. this is my POV of it. hope this helps though.