How Do Starting Signals Work in Athletics?

A sprint can be decided by a few hundredths of a second, so the start is more than a loud bang. In track athletics, a sequence of commands, a starter’s judgment and timing equipment work together to get everyone off the line fairly—and to catch a start that comes too soon.

The basic sequence

For a standard track race, the starter brings the athletes to the line and gives a verbal command before the starting signal. The commands depend on the distance and type of start.

• Races up to and including 400 metres: The starter says, “On your marks,” then “Set.” Athletes use a crouch start, normally with starting blocks, and must hold still in the set position until the signal.
• Races longer than 400 metres: The starter says, “On your marks.” Athletes take a standing start. Once they are steady and the starter is satisfied, the signal is given; there is no “Set” command.

Relay races of 400 metres or less also use the crouch-start commands for the first leg. In longer races, athletes start standing. The exact arrangement at the line differs by event: sprinters may start in separate lanes, while longer-distance runners often line up together or use a waterfall start.

What the starting signal sounds like

At major meets, the familiar starting pistol is commonly an electronic device. When the starter activates it, the system sends a signal to the timekeeping equipment and to speakers positioned at the lanes. That helps athletes hear the start at nearly the same time, whether they are in the inside lane or the far outside lane.

The gunshot is the cue to go—not the starter’s movement or the instant the gun appears to fire. Electronic timing begins from the starting signal, while cameras and other systems record the finish. This lets officials measure reaction times and resolve close results with precise timing.

At smaller meets, the equipment may be simpler, but the principle is the same: athletes wait for an unmistakable signal after the starter has given the appropriate command. If a runner moves before it, or the start is otherwise judged unfair, officials can recall the field with another signal.

False starts and reaction time

A false start happens when an athlete begins the starting action before the signal. In races using starting blocks, sensors can register pressure changes and help officials assess whether a runner reacted too quickly. Under World Athletics rules, a reaction time below 0.100 seconds is treated as a false start. That threshold is an officiating standard, not a claim that no athlete can physically react sooner; officials also consider the circumstances and the evidence from the start system.

In most individual track races, the athlete responsible for a false start is disqualified. The main exception is combined events such as the decathlon and heptathlon: the first false start in a race is charged to the field, and an athlete responsible for a later false start is disqualified. The starter and other officials monitor the line and equipment, then communicate the decision to the athletes and meet officials.

That rule makes patience part of sprinting. A runner who anticipates the gun may gain a fraction of a second, but if that movement is judged a false start, the race can be over before it has really begun. Experienced sprinters aim to react sharply while staying relaxed enough to hold the set position without rocking or twitching.

What happens if the start is recalled?

If the starter believes the start was unfair—for example, because a runner moved early or an outside disturbance affected the field—the race is stopped and the athletes return to the line. Officials investigate what happened and give instructions before restarting. A recall is not automatically a false-start penalty for every runner; the officials determine whether an individual broke the rules.

On a restart, athletes may be told to reset or adjust their position. They should listen for the commands again rather than assume the next sound will be the gun. In a championship race, even a short delay can add tension, but staying composed matters: the start routine is repeated, and the signal remains the cue.

How starts differ by event

Sprints

In the 100, 200 and 400 metres, each runner has a lane and uses blocks. The staggered lines in the 200 and 400 are designed to give athletes an equal distance around the bends. Blocks let sprinters brace against the track and drive forward, but they also make the set position strict: athletes must not begin their start before the signal.

Middle- and long-distance races

Events such as the 800, 1500 and 5,000 metres generally begin from a standing position. The 800 often starts in lanes before runners break toward the inside after the designated point. Longer races may use a curved or waterfall line so the field can start together without crowding every runner into one narrow section of track.

There are no blocks in these standing starts, but the need to wait for a fair signal is unchanged. Runners still need to avoid stepping over the line or moving forward before the start. A clean start is especially useful in a crowded distance race, where an early lurch can cause contact or disrupt nearby athletes.

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Frequently Asked Questions

Why are there two commands in a sprint start?

“On your marks” tells athletes to take their starting positions. “Set” tells them to settle into the ready position. The starter then waits until the field is steady before giving the signal.

Do all track races use starting blocks?

No. Blocks are used for races up to and including 400 metres, including the first leg of short relays. Longer track races use a standing start.

Can a runner be disqualified for one false start?

In most races, yes: the athlete responsible is disqualified. Combined events have a special rule: the first false start is charged to the field, while an athlete responsible for a subsequent false start is disqualified.

Does the starter’s gun start the timing?

The starting signal activates the electronic timing system. At major meets, the gun and lane speakers are linked so athletes receive the signal as evenly as possible.

Final Thoughts

Athletics starts combine a simple routine with careful officiating: take the right position, listen for the commands, hold steady and move only on the signal. Knowing the sequence makes races easier to follow—and helps explain why the officials take those first few seconds so seriously.