Board Thread:Theories and Speculation/@comment-3568954-20150530220024/@comment-26275777-20150530234535

Shadow Clones help you gain *experience*. They pass *information*, like you yourself stated, and I have no idea how you managed to leap from that to physical augmentation. Sure they can pass their left-over, *already moulded* chakra back to the original, but there is no evidence whatsoever that they transfer actual physical effects back to the user's physical body. In fact there's heavy evidence against it - Naruto doesn't get multiple stab/crushing/giant wounds from all the times his Shadow Clones are dispelled, and he's still a rather scrawny boy and not The Hulk by the end of the manga (by your theory the repeated use of clones in training and combat would have given him Raikage-sized muscles).

Also you're assuming, again without evidence, that chakra reserves can be expanded past a specific point per individual. Their bodies are human, not magic chakra containers. We've seen what happens when you overload a body that's not designed to hold so much chakra - with the Eight Gates, with Mitotic Regeneration, and to an extent with Naruto's demon fox cloaks. Your existing chakra coils aren't going to magically keep growing just because you keep training, just like muscles don't keep getting bigger just because you keep hitting the gym. In fact there's slight evidence that your chakra coils actually become fixed as you grow older, else why would they put so much emphasis on improving chakra control instead of simply improving your reserves?

And finally, Multiple Shadow Clones is a kinjutsu for a reason. You don't just make lots of clones and everything is peachy-pie. You're literally dividing up your life force, and if you run out you die. In fact, there is almost nothing in the manga to support the idea that clones can train longer (all together) than you could on your own if you're not Naruto. It worked for him because he already had the immense reserves to create lots of clones that still had enough chakra to work for ages. A person that has the stamina to work for say eight hours a day would still end up working for a total of eight hours a day, because each successive clone would only have a fraction of that stamina.