Fit people are statistically (and medically provably) healthier, smarter, better, more attractive, live longer, etc etc than fat people. I’m sure someone can find a video of a fit idiot and try to claim fit people aren’t smarter; but for every one of those there are 10 videos of fat idiots being even dumber. The simple fact for intelligence is that fitness improved cardio health which improves circulation for the brain, and the exercise improves coordination which is also good for the brain.