Tempo Run Timer

Common uses for a tempo run timer

Continuous threshold running
Cruise intervals
Marathon and half marathon preparation
Building sustainable speed

A tempo run is a sustained effort at or near lactate threshold — the intensity above which lactate accumulates faster than it clears. Practically it is the pace you could hold for about an hour in a race, and the usual description is comfortably hard: you can speak in short phrases but not hold a conversation.

Twenty minutes is the classic continuous tempo, long enough to provide a real threshold stimulus and short enough to recover from within a normal training week. Longer tempos exist and are valuable, but the marginal benefit falls off while the recovery cost keeps rising, which is why most programmes cap continuous tempo work well below race distance.

The most common error is running it too fast

Tempo pace is slower than most runners think, and a tempo run that leaves you wrecked was a race. The intensity is deliberately just below the point where the effort becomes unsustainable, and holding that restraint is the skill.

A useful check: you should finish feeling you could have continued for another five or ten minutes. If you could not, it was too fast, and the recovery cost will eat into the rest of the week.

Cruise intervals do the same job in pieces

Breaking the tempo into segments with short recoveries — three lots of eight minutes with a minute jog, say — accumulates more time at threshold than most runners can hold continuously, at a similar physiological cost.

The recoveries must be short. Extending them turns the session into something closer to VO2max intervals, which is a different stimulus with a different recovery requirement.

Where tempo sits in a week

Tempo is the session that most reliably improves endurance performance per unit of fatigue, which is why it appears in almost every distance programme. It also recovers faster than interval work, so it can sit closer to other quality sessions.

One tempo a week is a reasonable default. Two is possible in a high-volume block; three is usually how a runner ends up stale.

Conventional threshold session structures. Pace should come from a recent race rather than a goal time.

Tempo formats
Format	Structure	Time at threshold	Note
Classic continuous	20 min	20 min	The standard session
Extended continuous	30–40 min	30–40 min	Marathon blocks
Cruise intervals	3 x 8 min, 1 min jog	24 min	More volume, similar cost
Cruise intervals, longer	4 x 10 min, 90 s jog	40 min	Advanced
Progression tempo	20 min, getting faster	20 min	Finishes near 10K pace

You should finish able to continue another five or ten minutes. If not, it was a race rather than a tempo.
Keep cruise interval recoveries short — extending them changes the session into VO2max work.

Source: Widely used threshold training structures. Session formats are coaching convention supported by exercise physiology literature rather than a single published standard

Sources

Widely used threshold training structures. Session formats are coaching convention supported by exercise physiology literature rather than a single published standard , TheTimerLab — accessed 2026-07-28

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❓ Frequently Asked Questions

How fast is tempo pace?

Roughly the pace you could hold for an hour in a race — comfortably hard, where you can speak in short phrases but not hold a conversation. It is slower than most runners assume, and running it faster turns the session into a race.

How do I know if I ran it too fast?

You should finish feeling you could have continued another five or ten minutes. If you could not, it was too fast, and the recovery cost will eat into the rest of your week for no additional benefit.

What are cruise intervals?

The same threshold work broken into segments with short recoveries — three lots of eight minutes with a minute jog, for example. They accumulate more time at threshold than most runners can hold continuously, at a similar cost.

How long should the recoveries be in cruise intervals?

Short — a minute or ninety seconds. Extending them lets you run faster, which converts the session into VO2max work: a different stimulus with a different recovery requirement and a different place in the week.

How often should I do tempo runs?

Once a week is a reasonable default. Twice is possible in a high-volume block. Three times is usually how runners end up stale — tempo recovers faster than interval work but it is not free.

Why is tempo so widely prescribed?

Because it improves endurance performance more reliably per unit of fatigue than almost any other session, and it recovers quickly enough to sit near other quality work in the same week.