Lactate Threshold: What It Is and How to Train It
Your lactate threshold is the fastest pace you can sustain before fatigue rapidly builds. Learn what it means for racing and the best workouts to raise it.
May 20, 2026 · 2 min read
Your lactate threshold is the exercise intensity at which lactate begins to accumulate in your blood faster than your body can clear it. Practically, it's close to the fastest pace you can sustain for about an hour. Because it determines how fast you can run before fatigue spikes, raising your lactate threshold is one of the most effective ways to improve distance performance.
Lactate isn't the villain
Contrary to old myths, lactate doesn't cause muscle soreness, and it's actually a useful fuel. What matters for runners is the threshold — the tipping point where production outpaces clearance. Train to push that point to a faster pace, and you can sustain quicker speeds before the wheels come off.
Why threshold matters more than VO2 max for many
Two runners can have a similar VO2 max but very different race times, largely because of differences in lactate threshold and running economy. For 10K to marathon racing, the percentage of your VO2 max you can sustain — driven by your threshold — is often the more decisive factor.
Workouts to raise your threshold
- Tempo runs: 20–40 minutes continuous at threshold effort.
- Cruise intervals: 3–5 × 5–10 minutes at threshold with short recovery.
- Progression runs: build from easy to threshold effort over a run.
- Long runs with a threshold finish: practice holding effort while fatigued.
Effort, not all-out
Threshold work should feel comfortably hard and controlled — sustainable for the whole session. Running it too hard turns a threshold workout into an interval session and undermines the specific adaptation you're after.
How to find your threshold pace
A practical estimate is your current 10K race pace, or the pace you could hold all-out for about an hour. Lab tests and some wearables provide more precise figures, but for most runners, training by feel and recent race results works well enough to target the right effort.
Frequently asked questions
What is lactate threshold pace?
It's roughly the fastest pace you can sustain for about an hour — close to 10K to 15K race pace for many runners. It marks where blood lactate starts rising sharply.
How do I improve my lactate threshold?
Tempo runs and threshold intervals are the most effective workouts. Sustained, comfortably-hard efforts of 20–40 minutes (or broken into cruise intervals) train your body to clear lactate more efficiently.
Is lactate threshold the same as anaerobic threshold?
The terms are often used interchangeably, though physiologists distinguish nuances between them. For practical training purposes, both refer to the effort where fatigue-causing byproducts begin to accumulate rapidly.
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