Exercise 'aversion' isn't some new strange thing.
It's a result of evolution selecting it as a valid method of survival - don't waste energy, be as efficient as possible with what energy you have, as getting more can be dangerous, and tricky - or was before farming, just eat, and supermarkets were invented.
Look at most animals, do they go down the gym? Do they go on pointless walks/runs (other than territorial maintenance/enforcement and hunting/grazing)? Do they lift heavy things for no obvious reason?
No, what they do, mainly, when not hunting, eating, etc. is socialise or sleep.
Why would humans be any different?
It's not aberrant behaviour, it's the way we are supposed to be - all that's changed is external factors, like desks, supermarkets, cars, and of course, TV. All 'invented' in an attempt to use less energy to meet our needs/desires, to increase 'efficiency'. Efficiency, the desire to use less energy, is built into us, at a cellular level.
The things that weren't like this died, probably from starvation, due to using more energy than they could replace, coz they were 'inefficient', or at least not efficient enough.
Everything is about energy, teeth are about applying a local force that overwhelms the local resources of the thing they are biting, the bigger those resources the bigger teeth are needed to so so. Hunting is about energy, having more, or being more efficient, than what you are hunting.
So being efficient, and energy sparing, apart from on the few occasions you need to use it, is not only advisable, it's essential - without doing so you die (at least from a species point of view).
