Dōjini saikyō to saijaku / Strongest and weakest at the same time

We find ourselves in a world very similar to the Middle Ages, except for one fact, in this world the value of a human being is created by his level and his mode. The level is how far the person has taken their power. The mode is the way in it increases its level, there are several modes, in the most known way is that by the physical one. The most powerful modes are: by eating and playing sports The weakest modes are: by breathing and electricity.