Board Thread:Naruto Discussions/@comment-24898250-20140730025315/@comment-24531362-20140730113656

Elveonora wrote: Aren't they the same?

Not entirely. As we all know, base taijutsu does not require chakra input; no chakra is required to punch someone really hard. However, no one can punch forever, even in Naruto. This is because they run out of stamina: either they have burned through all the ATP in their cells available to provide energy, and need rest and carbs, or their muscles are too torn from use to function properly.