This is true only if your definition of “computer nerd” includes terrible shape and never working out.

I don't know... looking back at my career software engineers I've worked with have on a whole been overweight or skinny fat.

Honestly can't remember chatting to any of them about the gym - there's been a couple into biking or swimming but only really a handful that seemed into the gym or into doing sports of some kind.

As a software engineer, I would classify myself as a computer nerd, but honestly feel a bit out of place with a lot of ppl that work in the industry. I don't watch Dr Who or Star Trek, don't read fiction, and I enjoy extreme sports, martial arts etc.

It can feel like a strange dynamic, and I can see how thinking of a "computer nerd" brings up an image of Bill Gates or Comic Book Guy from the Simpsons for most people.

Martial arts fits into a particular (now rather outdated) hacker stereotype that can be seen in The Jargon File.

Because most stories are told through stereotypes, not through deep diving into every character's background and motivations. James Bond wouldn't be as fun if you got the back story about the Russkies he callously snapped the neck of and saw that they only took what he thought was a low key security job because he needed to pay for cancer treatment for his babushka.