The Sting Effect
A 12-year-old soccer player wears a lightweight wristband and weaves through a course of fluorescent cones. Every time her footwork is slightly off, she feels a gentle vibration—like a tiny scorpion sting—that instantly corrects her form. After completing the drill, she sees her entire path rendered as a pencil sketch on her coach's tablet, with her actual movements overlaid in red, showing exactly where she lost milliseconds and how to fix it.