The only sport where reacting too quickly is prohibited 😲
In track and field and sprinting, there's a reaction time rule that can lead to disqualification even with a perfect start. A too-quick reaction to the starter's gun can be considered a false start by the system.
Professional runners train their reaction time for years, but if the sensors record a time of less than approximately one-tenth of a second, the result is considered physiologically impossible for a human. Therefore, the attempt is disqualified even if the athlete started moving after the sound. This fact about the competition rules surprises many and demonstrates how technology controls the integrity of the start.