Reihai Myaku

Reihai Myaku (霊配脈, "Spirit Arranging Pulse") is an advanced form of. It takes the technique of reeling in the user's spiritual pressure until it no longer is able to be released from the body. As such, it no longer exists in the form of. This is done by redirecting the flow of from its source, altering its own behavior so that it does not release reiatsu but instead courses throughout the body, significantly enhancing the user's internal organs and muscles. It utilizes the theory of "throwing away" reiatsu in exchange for a vast increase in physical prowess, which was coined by, although mistakenly attributed to.

Overview
This technique can only be done by someone that is able to fully control their spiritual power to the point that they can alter its own natural behavior. Reiryoku naturally flows out of the body as reiatsu, and through training, one can learn how to harness and control how much and what shape it takes. Further training enables one to even control how it is released, and taking it a step higher, reiryoku emission itself can be changed. In altering its nature to be released as a pressure, it instead is coursed throughout the body, empowering internal organs and muscles. By dong so, one essentially "discards" their reiatsu as reiryoku no longer takes on an emitted form but rather circuits throughout the body. It can be likened to that of the  technique.