Board Thread:Theories and Speculation/@comment-27295021-20180312094223/@comment-734582-20180321081117

According to databook 1 or 2, by the way, using chakra to temporarily improve the body is what Shunshin (Body flicker) IS.

So, in a sense, this jutsu already exists. A person would have to train to differently energize the injured part, but in essence it's the same thing.