How can Nami's punches hurt Luffy so much?


In One Piece anime, there are many instances where Nami has beaten Luffy to a
horrible state,

Episode # | Screenshot  
---|---  
Episode 215 |
[![](https://i.stack.imgur.com/vBR53m.jpg)](https://i.stack.imgur.com/vBR53.jpg)  
Episode 316 |
[![](https://i.stack.imgur.com/2l6UZm.jpg)](https://i.stack.imgur.com/2l6UZ.jpg)  
Episode 572 |
[![](https://i.stack.imgur.com/Dr6zvm.jpg)](https://i.stack.imgur.com/Dr6zv.jpg)  
  
and maybe many more.

How is she able to do it? Does she know how to use Haki?




Here's another answer, also on
[SBS](http://onepiece.wikia.com/wiki/SBS_Volume_43)

> D: Blows shouldn't hurt Luffy, so why does he get bruises and swelling when
> Nami and the others beat the crap out of him?! Tell me!!! P.N. Zororin Love
>
> O: When the crew beats up on each other, it's always in admonishment with a
> strong sense of purpose, which is why it works so well!! It works on his
> spirit!! I bet Nami is thinking, "It's his spirit that hurts deep down!!"
> ...right? I guess not.

So Nami and others didn't punch Luffy physically, but they hurt his spirit,
and with doing so, his body also get hurts

> right? I guess not.

I think Oda doesn't really want to give any logical answer here




Here's another answer, also on
[SBS](http://onepiece.wikia.com/wiki/SBS_Volume_43)

> D: Blows shouldn't hurt Luffy, so why does he get bruises and swelling when
> Nami and the others beat the crap out of him?! Tell me!!! P.N. Zororin Love
>
> O: When the crew beats up on each other, it's always in admonishment with a
> strong sense of purpose, which is why it works so well!! It works on his
> spirit!! I bet Nami is thinking, "It's his spirit that hurts deep down!!"
> ...right? I guess not.

So Nami and others didn't punch Luffy physically, but they hurt his spirit,
and with doing so, his body also get hurts

> right? I guess not.

I think Oda doesn't really want to give any logical answer here

