Threshold Workouts: Why and How to Integrate Them
The "threshold" — you hear about it all the time in training, yet it's one of the most misunderstood concepts. Lactate threshold, anaerobic threshold, ventilatory threshold… the names vary, but the principle remains the same: it's the intensity at which lactate accumulates faster than your body can clear it. Personally, I believe it's THE training zone to prioritize.
What is Lactate Threshold?
In essence, your lactate threshold corresponds to the pace you can maintain for about 50 to 70 minutes in a race. For most of us, this falls somewhere between our 10K and half marathon race pace. In terms of heart rate, we're talking about roughly 85-90% of your MHR. For VO2max, it's around 80-88% of your VO2max.
Practically, working at your threshold helps your muscles better utilize and recycle lactate, pushes back the point at which you switch to anaerobic metabolism, and improves your endurance when you pick up the pace. In short, it delivers tangible results.
Types of Threshold Workouts
The Classic Tempo Run
20 to 40 continuous minutes at threshold pace, with a solid warm-up beforehand and a cool-down afterward. This is the basic, simple, and effective workout. Example: 15 min easy jog + 25 min at threshold pace + 10 min cool-down.
Cruise Intervals (Daniels' Method)
The idea is to break up the threshold effort into blocks of 5 to 10 minutes with 1 to 2 minutes of jogging recovery in between each. Example: 4 × 8 min at threshold / 2 min recovery. The benefit: you accumulate more volume at threshold than you would continuously, because the short breaks allow you to maintain quality. Personally, this is my preferred format.
Progressive Tempo Run
You start slightly below your threshold pace and finish slightly above it. Example: 30 min, increasing your pace by 5 sec/km every 10 min. This is great for developing your feel for pace and learning to manage effort over time.
Benefits of Threshold Training
- Improves endurance at faster paces
- Delays the anaerobic threshold
- Prepares you for 10K to half-marathon race paces
- Less taxing than short interval training
Risks if Poorly Executed
- ‘Gray zone’ if too fast → excessive fatigue
- Too frequent → overtraining
- Difficult to pace without benchmarks (HR or pace)
- Does not replace easy, foundational endurance runs
Frequency and Placement in Your Week
One threshold workout per week is largely sufficient for most runners. Two is possible if you're experienced and deep into 10K or half-marathon training. Estimating your target race time allows you to precisely dial in your threshold pace.
My recommendation: schedule your threshold workout in the middle of the week, well separated from your weekend long run and your interval training session.
“Lactate threshold is the cruising speed of your aerobic engine. Improving it is like shifting from 4th to 5th gear: you go just as fast while consuming less fuel.”
— Classic analogy in exercise physiologyMy Takeaway: Threshold training is one of the most effective workouts you can do, whether you're preparing for a 10K or a marathon. A 20-40 minute tempo run or 4 × 8 min cruise intervals: once a week, and you're good. The key is finding the right pace — not too slow (you waste your time) and not too fast (you burn out without extra benefit).
Frequently Asked Questions
How do you determine your lactate threshold?
Your lactate threshold generally corresponds to the pace you can sustain for about 1 hour in a race, roughly 85-88% of your MHR or your half marathon pace.
What's the difference between Threshold 1 and Threshold 2?
Threshold 1 (aerobic threshold) is roughly marathon pace, and Threshold 2 (anaerobic threshold) is about half marathon pace. Double threshold training combines sessions at both intensities.
How many threshold workouts per week?
For most recreational runners, 1 to 2 threshold workouts per week are sufficient, with the rest of your runs being at an easy, foundational endurance pace.