Flesh, Energy, Transmutation?
I think it would be more accurately called spiritual alchemy by the western magic frame of thinking?
Essentially, aside from the abrupt title... what i'm referring to here is the changing of the human flesh body in a sense by replacing it standard energies and contained nuances with potent forms of so-called 'high energy' material which would basically change the base components of the body inwardly, such that it no longer is afflicted by illness, fatigue, metabolism or various other impediments generated by existence in this current era, in addition to many other things derived from 'magic' would then basically bestow a degree of longevity as much as one would deem appropriate (not need for physical immortality after all). I had a realization on my own early on that it was possible to do this, however i have not yet the finesse and understanding to fabricate a method or path of my own making to achieve such a state.
One of the more accessible works in human reach, aside from individuals who found out and finished it without saying or entities that provide such information on the bar of 'maturity' would be that of Falun Dafa. I don't think its very much common knowledge, so one may need to look up what Falun Dafa is.
The short explanation is its supposedly an ancient form of qigong in the buddhist vein originally only taught to individuals of high character and cultivation, publicized by someone known as Li Hongzhi who has also explicitly said that the ''public" version is a downgraded variant that everyday folk even can take up to practice, although advancement is based on one's inner virtue and whatnot. Despite this, the public version is said to be of much higher level than almost every form of energy working/qigong available to most, roughly 'intermediate' so to speak, incorporating the installation and use of 'Falun' which translates as 'Law Wheel'; which would be representations of universes themselves, or rather those are micro universes as well. All of this them provides a constant state of cultivation to the practitioner so advancement is quicker with 24/7 'practice' in that sense.
Of course i am thinking of 'hijacking' the principles of such a thing, create a similar construct and formulate a system of workings for myself to move according to what parameters i need...