Training

What Is a Tempo Run?

Published September 1, 2026 By SUBNONE

A sustained 20-30 minute effort at a comfortably hard pace — a few words, not a full sentence. How to judge it, structure it, and avoid running it too fast.

A runner holding a sustained hard effort along an empty riverside path

The short answer: a tempo run is a sustained effort at a comfortably hard pace — typically 20 to 30 minutes where you could speak a few words but not a full sentence. It trains your ability to hold a strong pace for longer, and it's the single most useful hard session for most distance runners.

What comfortably hard means

It's a deliberately contradictory phrase, and a useful one. Tempo effort sits at the point where the run demands your attention but isn't a struggle. You're working, you're aware you're working, and you could sustain it for a good while longer if you had to.

The speech test: at easy pace you can say a full sentence. At tempo you can manage three or four words. At interval pace you can't really talk at all.

A rough guide is the pace you could hold for about an hour if you were racing. For many people that's somewhere near their 10K pace, or a bit slower.

What it's actually training

The usual explanation involves lactate threshold — broadly, the intensity above which fatigue-related byproducts accumulate faster than your body clears them.

Training at or near that intensity raises it, meaning you can run faster before hitting that point. In practical terms: the pace that used to feel hard starts feeling manageable.

This is why tempo work matters for 5K through marathon. It improves the pace you can sustain, which is what those events are actually asking of you.

How to structure one

Always with a proper warm-up. Going straight into tempo effort cold is unpleasant and raises injury risk.

Continuous tempo: 10-15 min easy warm-up, 20 min at tempo effort, 10 min easy cool-down.

Broken tempo, easier to manage when you're new to it: 10-15 min warm-up, then 3 × 8 min at tempo with 2 min easy jogging between, then cool down. The short breaks make it considerably more approachable for the same total work.

Start at around 15-20 minutes of tempo and build toward 30 over several months. There's no need to go beyond that for most purposes.

The most common mistake

Running it too fast. Tempo is not a race and not an all-out effort. If you're fading badly in the last five minutes, or finishing barely able to speak, it was too quick.

A well-executed tempo run finishes with you tired but composed, feeling you could have held it a few minutes more.

The second most common mistake is doing them too often. One hard session a week is enough alongside easy running.

When to start doing them

Once you can run comfortably for 40 minutes or so, and have a few months of consistent running behind you.

Before that, more easy running will do more for you than any tempo session. Beginners get faster by running more, not by running harder. See what an easy run is.

Tempo versus intervals

Tempo is sustained and moderately hard; intervals are short and very hard with recovery between. Tempo builds the pace you can hold for a long time; intervals build top-end speed and efficiency.

For most people training for 5K and upward, tempo is the higher-value session. See what interval training is.

Where to do one

Flat, uninterrupted ground is ideal, since frequent stops break the sustained effort. A park loop, a quiet path or a track all work. Hills make holding an even effort harder, though they're not a problem if you judge by effort rather than pace.

A note on effort

Hard sessions belong on days you're reasonably fresh. If you're already tired, an easy run or a rest day will serve you better than a compromised tempo. Persistent fatigue is a signal to back off rather than push through, and worth raising with a GP if it continues. General guidance, not medical advice.