"As I have already instructed you both, get going." Jack said and blew into the whistle.
A loud sound from the whistle echoed in the training hall.
Jason gritted his teeth and started doing push-ups while there was a heavy-looking backpack on his back. It was as big as Jason's entire back. It also weighed over 100 kilograms.
At the same time, Jason activated his All-Fire on his eyes. His deep blue eyes disappeared, replaced by scarlet-red ones. He was forced to do that to drain his stamina quicker.
According to his father, draining the stamina constantly was the ultimate way of increasing stamina. However, that wasn't enough. Jason also had to push his body to the limits of mortality, so his body also learned that feeling.
