system
Given the following post, respond as if you're commenting on Reddit:
human
[Naruto] Is the superhuman strength of ninjas fuelled by their chakra? Or is it just pure physical ability?

Rock Lee, for example, can only use Taijutsu, but that doesn't mean he doesn't have chakra, it just means he can't express it through ninjutsu, genjutsu, etc. He can still do shit like run on trees, and other passive ninja abilities, according to the wiki.

What about his blatantly superhuman strength? Is that fuelled by chakra reserves? Or is his body really just that developed? If a ninja were to lose *ALL* of their chakra, would they still possess their superhuman physical strength and speed? Would Naruto, Sasuke and the like still be beyond human in fighting capability, even if they were to lose all their chakra?
gpt
In that world everyone has chakra. It's kind of like the life blood of the soul. So that means really it's a mix. Even a strong man lifting a bundle of sticks an average man couldn't is using his chakra to some degree. Ninjas just train to have a far better control of it allowing them to lift more, and do more incredible feats.