Yi Yu also has some knowledge of the world's martial arts cultivation. If he cultivates internal strength, he is called a martial artist. Even if he reaches the master's level of internal strength, he can only be regarded as an expert. Only when he steps into the innate level can he be regarded as a strong one and truly understand the true meaning of martial arts.

in addition to self perception of the nature, it also needs huge energy to stimulate the orifices and acupoints, improve the body, turn the internal strength into the true yuan, and change the bone, so as to open the mysterious nature.

but the process...