After a couple more minutes of arguing, Shang finally got his answer.
According to teacher Loran's explanation, to advance in the Soldier Stage required the warrior to strengthen different parts of their body.
A normal human would reach the Initial Soldier Stage by simply becoming an adult. The natural presence of Mana in the surroundings strengthened their bodies naturally to a certain extent.
Because of that, even the most normal adult already had a body on the level of a professional athlete on Earth.
Of course, reaching the Initial Soldier Stage at the age of 18 was already way too late for someone that wanted to become a warrior. If someone wanted to become a warrior, they needed to reach the Initial Soldier Stage at the age of 14, at the latest.
The way of reaching the Initial Soldier Stage early was very simple.
Normal training.
