Actually same thing works in reality, maybe not for everyone. But I'm a sportist and I know from my own experience, when you are really tired and barely can move, you still can manage enough strengh and stamina to do last attack or speed up or whatever you are doing. Of course it also depends on personality and their determination, someone might flatly fall on their fac once they get tired.
Don't get me wrong, Naruto has a lot of flows and sometimes this last attack thingy is over done but it isn't completly made up.
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