The first week of training was the most boring time for the new members. They just stood for eight hours a day, doing nothing. Silent and not moving.
However, as they entered the second week, they missed the boring training.
Isaac trained the physical endurance of the new recruits. They were obliged to spar with each other all day long. Once every thirty minutes, they changed partners to spar again. If normal physical combat wouldn't be a problem for hunters, they were required to spar with all their skills. In other words, they continued to drain their mana non-stop.
If their mana ran out, they were allowed to rest for twenty minutes. After that, they should return to sparring again.
The purpose of the training was to measure the endurance and mana capacity of each human soldier. Mana was the most crucial thing in a battle; like energy. When mana was no longer flowing in the body, they would weaken. If that happened in the battle, the result would be death.