Coach Chen hadn't said anything. He waited until the three games were over before walking over and asking curiously, "Yin Guo, you've changed your playing style lately, and you've improved a lot. How did you manage that? At your original level, it would've been very difficult to improve any further."
Yin Guo glanced at Wang Yue in the distance. Seeing that he didn't seem to mind, she smiled and said, "Because I have a secret weapon now!"
As she spoke, she took a pressure sensor out of her pocket and presented it to Coach Chen like a precious treasure.
Looking at the metal cylinder, Coach Chen asked in confusion, "What's this?"
Yin Guo quickly took out her cue and unscrewed it into two pieces. She inserted the metal cylinder into one half, then pulled out her phone and opened the app. Handing the phone to Coach Chen, she said earnestly, "Coach, look at these numbers. They show the force of each shot I take."
As she spoke, she set up the nine balls again and started another game.
The teammate who had played against Yin Guo earlier was curious too, but he still agreed to play another game with her.
Looking at the data on Yin Guo's phone, Coach Chen saw that the force of her shots varied by only half a newton. He was stunned. Excited, he asked, "Yin Guo, are these numbers real? They're incredibly consistent!"
Yin Guo smiled. "Coach, it's because we've been training for a long time. Try controlling the force of each shot yourself. You might be even more consistent than I am."
Coach Chen didn't believe her, so he took Yin Guo's cue and set her phone on the table. He tried a few shots. When he deliberately controlled his force, he was indeed