I'm going to generalise a little bit from your statement about sports: it is dangerous to disregard the body (Sports) and focus mostly on the mind (Where things that would allow someone to excel in CS are). You don't need to be a sports star. Even just someone who exercises casually or plays sports socially.
Someone's physicality (Let's move on from just thinking about sports only) can/does have relevance to someone's aptitude for CS, or, their ability to do well.
"Someone's physicality (Let's move on from just thinking about sports only) can/does have relevance to someone's aptitude for CS, or, their ability to do well."
"Exercising casually" is not the sort of "well-roundedness" that colleges select for. They look for "team captain", which, by the way, is far more common when your (expensive, private) school has 100 students instead of 1200 like a common public school.
Someone's physicality (Let's move on from just thinking about sports only) can/does have relevance to someone's aptitude for CS, or, their ability to do well.