Why does it feel like some people have unlimited energy?

I genuinely don't understand how some people seem to have energy that never runs out. I feel like I do most of the things people recommend. I try to eat reasonably well, get enough sleep, exercise consistently, drink enough water, avoid staying up too late, and keep some kind of routine. When everything lines up, I feel pretty good. But then I see people who somehow operate at a completely different level.

I know people who can work a demanding job, train several times a week, manage relationships, handle stressful situations, and still have enough energy left to be productive afterwards. Meanwhile, I can have a "perfect" day and still feel like my battery is at 40%. And some of these people aren't even doing anything extreme. They aren't living on caffeine and motivation speeches. They just seem to have figured out something about maintaining their energy that I haven't.

I've started paying more attention to the basics instead of only looking for productivity tricks. Things like nutrition quality, recovery, digestion, and overall health seem to play a bigger role than I used to think. Still not convinced there is one secret answer though.

Maybe some people just have better genetics. Maybe they built better habits over years. Maybe they are just better at avoiding the things that slowly drain energy.

I’m curious what everyone else thinks.

Are some people naturally wired to have more energy, or are they just better at managing it?