Training is a virtual experience mimicking a real fight scenario, where a real player fights against AI. This is used to increase fighting skills, which are used to determine the winner in the battle.
Training uses player energy, however, it does not use the players hitpoints. Players have to choose the equipment that is going to be used during training, this makes this type of player progression meaningful.
Training takes time and uses energy. The time of a training session is defined by a player's training skills.