Extreme Fist practitioners harbor energy within, see nothing else but their forms and boxing methods. To Casio, Extreme Fist corresponds to an aloof personality, clearly revealing the traits of this ultimate path. Extreme self-discipline, extreme self-cultivation, changes in the external environment, no matter how harsh, could not affect the existence of Extreme Fist. This represents a realm, and similarly, a way to thoroughly follow the path.
Therefore, the cultivators of the Extreme Fist Path, who want to align their state with that realm and grasp the heart of Extreme Fist, the simplest and most direct method is—Asceticism! Or to elaborate a bit, painful cultivation.