Bones, tendons, skin. The three aspects that created the endurance of a warrior. Endurance in a witch hunter's eyes wasn't your body endurance to physical workload, that was Stamina. Endurance was how your body reacted with pain and dealt with it.
To strengthen the defense of your body, you must do it from the inside and from the outside simultaneously. And in the end, once they met in the middle, they would create an impenetrable wall.
Endurance was the monk's specialty in Siderius' old world. They excelled in figuring out the composition of the body and enhancing it.
The body was improved by a set of movements. The monks called these movements Harmony Frameworks and had developed many different sets that were specialized for different tasks.
One could not train his body to excel at everything. He must choose which would be his specialties and his weaknesses.
