Not to nitpick Vivek, but I will say, I'm pretty sure everyone on the math team at my school also did a sport. I'm pretty sure the majority were three season athletes.
Discussion
My two sats: I was on math team, lacrosse, and football and cross country just to fill in the winter.
I think his comment about the jocks getting favored while the successful nerds get pushed aside came from 80s movies. I don't know how real it is today.
Granted I went to a relatively small school, so you had to wear multiple hats.