We are a commune of inquiring, skeptical, politically centrist, capitalist, anglophile, traditionalist New England Yankee humans, humanoids, and animals with many interests beyond and above politics. Each of us has had a high-school education (or GED), but all had ADD so didn't pay attention very well, especially the dogs. Each one of us does "try my best to be just like I am," and none of us enjoys working for others, including for Maggie, from whom we receive neither a nickel nor a dime. Freedom from nags, cranks, government, do-gooders, control-freaks and idiots is all that we ask for.
I would have guessed that there would be a Gaussian distribution, but now I wonder about Pareto instead. The math of it is challenging for me, though. It's been a long time since I have used Functions.
Anyway, adult people do vary enormously in their energy levels, ambition, and physical determination. We all know that because it is obvious in the modern world wherein many people have choices of activity levels.
One thing that I am comfortable asserting is that a one hour workout daily (especially something like the Maggie's Routine) will increase your energy and drive to exert yourself. It works. Try it, if you disapprove of your slothfulness or lack of strength and physical endurance.
It's because we are neither bonobo or chimpanzee, we are human and capable, yes, of free agency. It'd be called free will but my answer is meant in a secular way. I mean who wants 21 hours a day of working your butt off for food, shelter and warmth?