The nerd/jock dichotomy is at best loosely pointing at some genuine clusters of interests and predilections that exist among people in the world, and is more often taking a set of tropes from 80s Hollywood movies about high school and using them to try to explain how real people in the world are today, which is stupid.
(Who wrote all those 80s movies? Bookworms! Who acted in them? Theater kids!)
The jocks at my school (Championship Winners) were also simultaneously the smartest kids at it. Most went to Ivy Leagues on academic scholarships. I know a few of them were the first engineers on several well known unicorns.
There is an unspoken presumption many people live believing that the various qualities people can have must be evenly divided among people, because somehow it would otherwise be “unfair”. Got brawn? Can’t have brains. Got X? Can’t have Y. Etc. It’s a coping strategy for weak people with big egos.
The fact is that in primary school, a “nerd” wasn’t necessarily all that “intelligent” even in some narrow sense. If you are inept at something or insecure about it, you might gravitate toward things that avoid it. So you invest time in that activity.
Of course, if the brain is the seat of intelligence, and the brain is just a part of the body, and an intelligent brain is a healthy brain, then it follows that a healthy body overall is more likely to have a healthy brain and thus an intelligent brain. Conpare this with the ancient expression “Mens sana in corpore sano”.
Indeed. People who use this terminology in earnest have a maturity problem. It’s a juvenile way of classifying the world that silly people like to use to channel their petty resentments and envies. Time to grow up.
a lot of us nerds value physical strength, it's 2025, we're not mouthbreathers anymore.