The Best Way to Increase Lactate Threshold: What the Science Says

If you could improve only one physiological marker to become a faster endurance athlete, lactate threshold would be near the top of the list.

In fact, many exercise physiologists consider lactate threshold to be a better predictor of endurance performance than VO₂ max.

Why?

Because lactate threshold determines how hard you can sustain an effort before fatigue begins accelerating rapidly.

It's the difference between comfortably holding a pace for an hour and blowing up after 20 minutes.

The good news is that lactate threshold is highly trainable.

The better news?

Most athletes aren't training it as effectively as they could.

Let's look at what lactate threshold actually is, why it matters, and the most effective ways to improve it according to the scientific literature.

What Is Lactate Threshold?

Despite what many people believe, lactate itself is not the enemy.

For decades, athletes blamed lactate for fatigue and muscle burn. We now know that's not entirely true.

Lactate is actually a useful fuel source produced during exercise.

The problem occurs when exercise intensity exceeds your body's ability to clear and reuse lactate and the associated hydrogen ions. As exercise intensity increases, lactate begins accumulating faster than it can be removed, eventually leading to a rapid increase in fatigue.

This point is commonly referred to as the lactate threshold.

Simply put:

Lactate threshold is the highest intensity you can sustain while keeping fatigue relatively under control.

For most trained athletes, this corresponds roughly to:

• A hard but sustainable effort
• About a 60-minute race pace
• A pace where speaking becomes difficult but not impossible
• Roughly the intensity of a 10K race for many recreational runners

Why Lactate Threshold Matters More Than VO₂ Max

VO₂ max measures the size of your aerobic engine.

Lactate threshold determines how much of that engine you can actually use.

Consider two athletes with identical VO₂ max values.

If Athlete A can sustain 75% of their VO₂ max before hitting threshold and Athlete B can sustain 90%, Athlete B will almost certainly outperform Athlete A despite having the same VO₂ max.

Research consistently shows that lactate threshold is one of the strongest predictors of endurance performance because it reflects your ability to sustain a high percentage of your aerobic capacity.

The Biggest Mistake Athletes Make

Many athletes assume the best way to improve lactate threshold is to spend all their time doing threshold workouts.

Ironically, that's often the fastest way to plateau.

Research and observations from elite endurance athletes suggest that lactate threshold improves through a combination of adaptations, including:

• Increased mitochondrial density
• Improved capillary density
• Better lactate transport and clearance
• Enhanced aerobic enzyme activity
• Improved cardiac output
• Greater fatigue resistance

These adaptations occur through a combination of easy training, threshold work, and strategically placed high-intensity training—not threshold workouts every day.

The Best Way to Increase Lactate Threshold

The evidence suggests that the most effective approach combines three key training components.

1. Build a Large Aerobic Base

This is the part many athletes overlook.

Before worrying about fancy threshold intervals, you need a strong aerobic foundation.

Easy aerobic training stimulates many of the adaptations that ultimately support a higher lactate threshold, including:

• Mitochondrial growth
• Increased capillary density
• Enhanced fat oxidation
• Improved stroke volume

Research on elite endurance athletes consistently shows that roughly 70–90% of training is performed at relatively low intensities. This large aerobic base allows athletes to tolerate and benefit from harder sessions later.

For most athletes, this means the majority of weekly training should still be easy.

2. Perform Dedicated Threshold Workouts

Specificity matters.

If you want to improve lactate threshold, you need to spend time training near lactate threshold.

Research reviews consistently identify threshold training as one of the most effective methods for improving endurance performance and raising threshold pace or power output.

Popular threshold workouts include:

Tempo Runs

Examples:

• 20–40 minutes continuously at threshold pace
• 30-minute steady-state effort
• 2 x 15 minutes at threshold pace

These workouts teach the body to sustain a hard effort while improving lactate processing and aerobic efficiency.

Cruise Intervals

Examples:

• 4 x 8 minutes at threshold pace
• 5 x 6 minutes at threshold pace
• 6 x 1 mile at threshold pace

Short recovery periods allow athletes to accumulate more total time at threshold without excessive fatigue.

Many coaches consider cruise intervals one of the most effective threshold training methods available.

The Sweet Spot

The key is that threshold workouts should feel "comfortably hard."

You should finish feeling challenged but not destroyed.

If every threshold workout feels like a race, you're probably running too fast.

3. Include Some High-Intensity Training

This surprises many athletes.

VO₂ max workouts can also improve lactate threshold.

High-intensity intervals increase aerobic capacity and create adaptations that allow athletes to sustain higher percentages of VO₂ max before reaching threshold.

Examples include:

• 4 x 4 minutes hard
• 5 x 3 minutes hard
• Hill repeats
• Short interval sessions

For most athletes, one dedicated threshold session and one higher-intensity session each week works extremely well.

How Long Does It Take to Improve Lactate Threshold?

The timeline depends on your training history.

Beginners often experience noticeable improvements within 4–6 weeks.

More experienced athletes typically require 6–12 weeks to see meaningful changes.

The most important factor isn't finding the perfect workout.

It's consistency.

Months of well-structured training almost always outperform a few weeks of heroic workouts.

Signs Your Lactate Threshold Is Improving

You don't necessarily need a laboratory test to see progress.

Common signs include:

• Faster pace at the same heart rate
• Higher power output at the same perceived effort
• Improved tempo run performance
• Faster race times
• Ability to hold harder efforts longer

For many recreational athletes, these practical improvements matter far more than a specific laboratory value.

Sample Week for Improving Lactate Threshold

A simple framework might look like:

Monday: Easy aerobic training

Tuesday: Threshold workout (4 x 8 minutes at threshold pace)

Wednesday: Easy recovery

Thursday: Easy aerobic training

Friday: VO₂ max intervals or hill repeats

Saturday: Easy aerobic training

Sunday: Long endurance session

This approach develops the aerobic base while providing enough threshold-specific work to drive adaptation.

The Bottom Line

If your goal is to improve endurance performance, raising your lactate threshold should be a major priority.

The most effective strategy isn't doing threshold workouts every day.

Instead, the research suggests combining:

• High volumes of easy aerobic training
• One to two threshold-focused workouts per week
• Strategic high-intensity intervals
• Consistent training over months and years

The athletes with the highest lactate thresholds aren't necessarily the ones doing the hardest workouts.

They're usually the ones who consistently build a large aerobic base and then layer threshold training on top of it.

In endurance sports, the best way to improve lactate threshold isn't training harder.

It's training smarter.

References

1. Faude O, Kindermann W, Meyer T. Lactate threshold concepts: how valid are they? Sports Medicine. 2009.
2. Subbarayalu AV, Chinnusamy S, Kumar VP, et al. Lactate Threshold Training to Improve Long-Distance Running Performance: A Narrative Review. Montenegrin Journal of Sports Science and Medicine. 2024.
3. Coaching Endurance Performance: Practical Ways to Improve VO₂ Max, Threshold and Economy. ACE Fitness. 2026.
4. Physiological Factors That Affect Maximal Oxygen Uptake and Lactate Threshold During Endurance Training. Science & Sports. 2025.