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A tempo run is a sustained run at a “comfortably hard” pace — faster than easy pace but slower than race pace. It’s one of the three most important training sessions for distance runners (alongside the long run and interval training), and it produces an adaptation that neither of the others can replicate: an improved lactate threshold.
What a Tempo Run Actually Is
The term “tempo run” is used loosely in recreational running, which causes confusion. There are two valid formats:
1. Continuous tempo run:
A sustained run of 20–40 minutes at a steady, “comfortably hard” effort. The standard definition of a tempo run. You run at one consistent pace throughout.
2. Cruise intervals:
Multiple shorter tempo efforts (e.g., 3 × 10 minutes at tempo pace with 90-second recovery jogs). These allow slightly more total time at tempo effort than a continuous run, with brief recovery between each. Useful for runners building toward a longer tempo run.
Both develop the same physiological adaptation — the continuous tempo is slightly harder (no recovery breaks), while cruise intervals allow more total quality volume.
What Tempo Running Does Physiologically
Your lactate threshold is the pace at which your body produces lactate (a metabolic byproduct of hard exercise) faster than it can clear it. Below this threshold, lactate is cleared as fast as it’s produced — you can sustain the effort indefinitely. Above it, lactate accumulates rapidly, causing the burning sensation and forced slowdown of hard running.
Tempo running trains your body to run at a higher pace before this threshold is crossed. The physiological mechanisms include:
- Increased mitochondrial density in muscle cells
- Improved lactate clearance by the liver and muscles themselves
- Better fat oxidation at higher intensities (reducing glycogen demand)
The practical result: after several weeks of weekly tempo running, you’ll be able to sustain a faster pace before hitting your ceiling. This directly improves 5K, 10K, and half marathon times.
What Pace Is Tempo?
Tempo pace is roughly 85–90% of maximum heart rate, or approximately:
– 10K race pace + 15–20 seconds per mile
– Half marathon race pace + 5–10 seconds per mile
– An effort where you can speak only in short phrases (3–4 words at a time) rather than full sentences
Examples by race pace:
| 5K time | Approximate tempo pace |
|—|—|
| 20 minutes (4:00/km) | 4:25–4:40/km |
| 25 minutes (5:00/km) | 5:30–5:45/km |
| 30 minutes (6:00/km) | 6:35–6:50/km |
| 35 minutes (7:00/km) | 7:40–7:55/km |
These are approximations — the talk test is the most reliable guide. If you can speak in full comfortable sentences, you’re going too easy. If you can only speak one word at a time, you’re going too hard.
How to Structure a Tempo Session
A standard continuous tempo run:
1. Warm up: 10–15 minutes of very easy running
2. Tempo: 20–30 minutes at tempo pace
3. Cool down: 10 minutes of easy running
Total duration: 40–55 minutes.
A cruise intervals session:
1. Warm up: 10–15 minutes easy
2. 3 × 10 minutes at tempo pace, with 90-second easy jog recovery between each
3. Cool down: 10 minutes easy
Total duration: approximately 55 minutes.
Starting out: If you haven’t done tempo running before, start with 15–20 minutes of continuous tempo and build by 5 minutes every 2–3 weeks until you reach 30–40 minutes.
How Often to Do Tempo Runs
One tempo run per week is sufficient for most recreational runners — adding more than one per week alongside a long run and easy running is likely too much quality volume for adequate recovery.
In a typical weekly training structure:
– Monday: Rest or cross-training
– Tuesday: Easy run
– Wednesday: Tempo run
– Thursday: Easy run (or rest)
– Friday: Easy run or rest
– Saturday: Parkrun or interval session (alternate with tempo)
– Sunday: Long run
Alternating between tempo runs and interval sessions each week is a common pattern — both are quality sessions, and running both in the same week is typically too demanding unless your weekly volume is high.
Tempo Running vs Intervals: What’s the Difference?
Both are quality sessions, but they target different physiological adaptations:
| Tempo run | Interval training | |
|---|---|---|
| Pace | ~10K race pace | 5K pace or faster |
| Duration | 20–40 minutes continuous | Short efforts (2–5 min) with recovery |
| Target | Lactate threshold | VO2 max |
| Recovery needed | 24–48 hours | 48–72 hours |
Both have a place in a training programme. Tempo running improves your sustainable pace ceiling; intervals raise your overall cardiovascular capacity. Most runners benefit from doing both across a training cycle, rather than focusing exclusively on one.
Summary
Tempo running is one of the most effective sessions available for improving race times at all distances:
- Tempo pace is “comfortably hard” — you can speak, but only in short phrases; roughly 10K pace plus 15–20 seconds per mile
- Start with 20 minutes continuous and build to 30–40 minutes over several weeks
- One tempo run per week is sufficient alongside long runs and easy running
- Use the talk test if you don’t have heart rate data — full conversations are too easy; single words are too hard
- Alternate with interval training across the training week — both serve different purposes and work best used together
Next read: What is interval training for runners?