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 215



Episode 316



Episode 572



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

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, &quot;It's his spirit that hurts deep down!!&quot; ...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