User blog comment:Guts!/Anime Depiction of Luffy's Gear Second/@comment-972068-20130528014001/@comment-10112860-20130529120325

Even if you think that the wiki says wrong things, if you can show me evidence from the manga that Luffy can't use gear 2nd in a particular part of his body after 2 years of training i suppose i can believe your thought. But as Galaxy said stop trying to bring science here. He is a rubber man, he can do as he pleases with his whole organs so the pumping of blood can easily be done in an instant after the training he received. Either way we will see if what i say is right in the flashbacks that oda probably give us at some time describing the training that everyone gone through.