Key takeaways
- A tempo run is a sustained 'comfortably hard' effort, usually around lactate threshold.
- It trains the body to clear lactate, raising the pace you can hold before fatiguing.
- Effort feels controlled but challenging — you could speak only a few words at a time.
- Typical sessions are 20–40 minutes of tempo, with a warm-up and cool-down.
What a tempo run is
A tempo run is a sustained effort at a ‘comfortably hard’ pace — around your lactate threshold — held for an extended period, often 20–40 minutes. It sits between easy running and hard intervals: challenging and focused, but controlled enough to maintain.
Why it works
At threshold, your body produces lactate about as fast as it can clear it. Training right at that line teaches the body to clear lactate more efficiently, which raises the pace you can sustain before fatigue forces you to slow — directly improving endurance and race performance.
After a 15-minute warm-up, a runner settles into a steady tempo effort for 25 minutes — breathing hard but in control, able to say only a few words at a time — then cools down. On hilly trail, they hold the effort steady even as pace rises and falls with the grade.
Tempo vs intervals
A tempo run is one continuous threshold effort; intervals are repeated faster bursts with recovery, training VO2 max and speed. Both have their place — see tempo run vs intervals — alongside playful fartlek sessions.
The bottom line
The tempo run is the classic threshold workout: a sustained, comfortably hard effort that teaches your body to hold a faster pace before fatigue takes over. Run it by effort (especially on trails), keep it controlled rather than all-out, and a weekly tempo session is one of the surest ways to build the endurance that pays off on race day.
Frequently asked questions
What is a tempo run?
A tempo run is a sustained run at a 'comfortably hard' pace — roughly your lactate threshold — held for an extended stretch, often 20–40 minutes. It's faster than easy running but not all-out, and it's one of the most effective workouts for improving the pace you can hold over a long distance.
What pace should a tempo run be?
Tempo effort is 'comfortably hard' — sustainable but requiring focus, often described as the fastest pace you could hold for about an hour. A talk test helps: you should be able to speak only a few words at a time, not full sentences (easy run) and not gasping (interval). On trails, run by effort, not a fixed pace, since terrain varies.
What's the difference between a tempo run and intervals?
A tempo run is one continuous, sustained effort at threshold; intervals are repeated shorter, faster bursts (above threshold) separated by recovery. Tempo runs build the ability to hold a strong pace; intervals build speed and VO2 max. Both belong in a balanced program. See our tempo run vs intervals comparison.
Sources
- Endurance training principles — American Council on Exercise
- Trail running training — American Trail Running Association