How much time each sport gives you
Set those against a simple reaction time of around 250 ms and the problem is obvious. In several of these sports, a purely reactive response arrives too late by definition. The players who succeed are not reacting to the ball; they are reading the bowler's arm, the server's toss or the striker's hips and committing before the event happens.
| Situation | Time available |
|---|---|
| Cricket ball, fast bowler, 22 yards | ~400 ms |
| Tennis serve at professional pace | ~500 ms |
| Penalty kick, 11 metres | ~400 ms |
| Baseball fastball from the mound | ~400 ms |
| Boxing jab at close range | ~150 to 250 ms |
| Sprint start reaction to the gun | measured, not chosen |
Sprint starts are the exception
A sprint start is one of the only sporting moments that is pure reaction. The gun is unpredictable, the response is fixed, and the time is measured directly by pressure sensors in the blocks. Elite reaction times sit around 120 to 180 ms.
Anything under 100 ms is ruled a false start under international rules, on the basis that a human cannot hear, process and push in less time — so a start that fast must have been anticipated. That threshold is a direct, competitive acknowledgement of the physiological floor this test also uses.
The rule does not care whether you guessed well. It assumes any sub-100 ms start was a guess, because every measurement says it has to be.
What trained athletes are actually better at
- Reading the cues that precede the event — body position, grip, the shape of a run-up.
- Narrowing the set of responses they are choosing between, which cuts decision time directly.
- Executing the chosen movement faster and more efficiently, which is training rather than reflex.
- Staying consistent under fatigue, when everyone else's slow trials start appearing.
- Recovering from a wrong commitment quickly, which matters more than never committing wrongly.
Training reaction for sport
The useful drills are sport-specific and involve genuine uncertainty: a partner who can go either way, a ball machine with randomised timing, small-sided games with constant decisions. Generic reaction drills — catching a dropped ruler, tapping lights on a board — improve you at catching rulers and tapping lights.
Test yourself here as a baseline and as a fatigue check rather than as a performance measure. A choice reaction test is closer to sport than a simple one, because sport almost never gives you a single possible response.