A Crazy Obstacle Course (Part 1)

...

After the time set by Old Man Lin had ended, the entire class quickly gathered and stood at the center of the activity field like a platoon of soldiers. They stood patiently while waiting for the old man to give his instructions.

Not long after, Old Man Lin stood in front of the group and examined their respective states with his gaze. And when he confirmed that all of the almost regained their peak forms, he nodded his head before extending his hand in the air and doing a downward pulling motion.

Bang!

Then a huge wooden box suddenly fell beside him out of nowhere. And with a flick of his wrist, the lid of the box was suddenly opened.

When the class peeked at what was inside the box, they saw a bundle of things that resembled a handcuff used to restrain criminals and prisoners.