One Piece fans have long wondered how Nami could beat up Luffy, even though his body was made of rubber. Here are some possible solutions.
A long-standing question in the fandom concerns how Nami could hurt Luffy. There is a huge power difference between the Straw Hat captain and Nami. However, his body is made from rubber so blunt force won’t work against him. Nami has repeatedly beaten Luffy until he was bloody, regardless of this fact. Similar questions were raised when Luffy’s fellow crew members beat him.

Everyone knows that Luffy cannot take these beatings from Nami. People continue to ask questions and try to find the answer, however. Many fans and Eiichiro Oda have shared their thoughts on how this phenomenon could be possible.
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Are There Any Reasons Nami Could Hurt Luffy?
Technically, this question already has a canon answer. Oda claims that Nami is attacking Luffy’s spirit, as well as his physical body. His logic was that these beatings are in admonishment with strong sense of purpose. That is why Luffy feels the pain and hit in his spirit.
The idea of beating up the Rubber Human may have some merit if you have the right convictions. Monkey D. Garp claims he was capable of beating his grandson due to the familial love he had for him. Perhaps Luffy’s hurt is an act of willful intent.
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But, it is possible that this answer may depend on when and how it was presented. When the Enies Lobby Arc was still in progress, he gave his response to the SBS for Volume 43. Oda may have had a concept in mind that was not yet presented to the story. Therefore, he kept it secret by giving a false answer. Even Oda admitted that he wasn’t 100% certain of the answer he gave.
Haki is an example of such an uninvented concept in the Enies Lobby Arc. While there were some clues about this power system’s existence, it would take many years for it to be officially introduced into the story. Many fans have been led to believe that Nami uses an insufficiently developed form of Armament Haki as a means to inflict damage on her captain through the introductions of Haki.
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Another possibility that has recently been added is Luffy’s Gum-Gum Fruit or, as it’s actually called, Nika, which is the Human-Human Fruit Model. The Mythical Zoan Fruit not only gives Luffy the ability to reach through eyeholes and bounce off the ground, but it also gives him the properties of rubber. This effectively makes Luffy a cartoon character.
Could Cartoon Physics have Something to do with it?

This could explain why Nami or a few others can beat Luffy. Remember that these beatings have a humorous effect. Luffy’s comical powers make him feel as much pain, as he does funny.
RELATED: One piece: Was Vegapunk York Ever Tall? Luffy’s enemies are often hurt when it’s humorous, which could explain why they have trouble getting him down. To cause long-lasting damage, the enemies must resort to old-fashioned Haki, which is either slashing or stabbing attacks, since Luffy is a serious opponent. Nami and Luffy wouldn’t get in a serious fight for any reason. Although it is possible to assign these cartoonish beatings as part of a story element, it is not a good idea. These are done to have a humorous effect. They are not discussed because they lack logic. The damage done is quickly repaired. They’re just one of many gags that One Piece uses, and it seems like that’s all their purpose.