The Norwegian Method: Double Threshold Training, Explained

When Jakob Ingebrigtsen runs away from the world's best over the final lap, people want to know what he does in training. The short answer is a system often called the Norwegian method: a lot of carefully controlled threshold work, measured with a lactate meter, sometimes twice in a single day. Here is what it actually is, why it works, where it does not, and who is using it.

What the Norwegian method actually is

Strip away the hype and it comes down to three ideas:

1. A large share of training sits at or just below the lactate threshold, the effort you could hold for roughly an hour. Not easy, not all-out. Controlled and repeatable.
2. Intensity is governed by blood lactate, not by ego. Athletes prick a finger mid-session and keep the value in a tight window (often around 2.5 to 3.5 mmol/L), backing off the moment they drift too high.
3. Volume is accumulated through "double threshold" days: two separate threshold sessions in the same day, each kept sub-maximal, so the athlete banks a huge amount of quality work without the wreckage a single brutal session would cause.

The architect of the modern version is Marius Bakken, a two-time Olympic 5000 m runner who reverse-engineered and documented the approach in the 2000s. The Ingebrigtsen brothers built on it, and it has since spread well beyond Norway.

The science behind it

Your body has two useful intensity landmarks. The first lactate threshold (LT1), often called the aerobic threshold, is where lactate first rises above resting levels, around 2 mmol/L. The second (LT2), the anaerobic or lactate threshold proper, is the highest intensity where lactate production and clearance still balance, classically near 4 mmol/L. Read the full definitions in our glossary.

The Norwegian method lives in the band just under LT2. Training there is the sweet spot for the adaptations that matter most to a distance runner: more mitochondria, better capillarisation, and a higher lactate-clearance capacity. Crucially, it delivers most of the aerobic stimulus of harder VO₂max work but at a fraction of the fatigue, so you can do it often and in volume.

That is the logic of double threshold. Rather than one painful session that needs days of recovery, you split the load: a controlled threshold set in the morning and another in the evening. Each stays sub-maximal, lactate never spikes, and over a week the athlete accumulates far more time near threshold than a conventional plan allows. The lactate meter is the governor that keeps each rep honest, because going just 0.2 m/s too fast turns a sustainable session into a damaging one.

This sits inside a long-running debate about intensity distribution. Stephen Seiler's research popularised the polarized model: mostly easy, a little very hard, and not much in the middle. The Norwegian method is better described as threshold-heavy or pyramidal: a big base of easy running, a substantial block of controlled threshold, and only a sprinkle of truly hard racing-speed work. Both camps agree on one thing: most training should be easy, and the hard parts should be precisely dosed.

A typical Ingebrigtsen-style double-threshold day might look like 5 x 6 minutes at controlled threshold in the morning and 10 to 12 x 1000 m, again at threshold, in the evening, all bracketed by easy mileage that pushes the week well past 150 km.

Who is doing it

• Jakob Ingebrigtsen, Olympic 1500 m champion and multiple world champion, is the poster athlete, along with brothers Henrik and Filip.
• Marius Bakken, the system's architect, still coaches and documents the model.
• Kristian Blummenfelt (Olympic triathlon champion) and Gustav Iden (Ironman world champion), guided by Olav Aleksander Bu, run an even more data-obsessed, lactate-driven version in triathlon.
• Narve Gilje Nordås, a world-championship medallist over 1500 m, trains in the same Norwegian threshold tradition.

When a method produces Olympic gold across distances from 1500 m to the Ironman, people pay attention.

What it does well

• High quality without high risk. Capping intensity by lactate lets athletes train hard, often, with a lower chance of overreaching or injury than VO₂max-heavy plans.
• Precision. A number replaces guesswork. You are not "running hard," you are holding 3.0 mmol/L.
• Aerobic development at scale. Lots of time near threshold is a potent, well-evidenced driver of endurance fitness.
• A proven ceiling. The results at the very top of the sport speak for themselves.

Where it falls short

• It needs a lactate meter and the skill to use it. Strips cost money, finger pricks mid-interval are fiddly, and the readings only mean something if you have calibrated your own thresholds first.
• Thresholds are individual. "4 mmol/L" is an average, not a law. Get the target intensity wrong and the whole system misfires.
• The volume is enormous. Two threshold sessions a day on top of easy mileage assumes a professional's time, recovery, and support. For someone training around a job, it is simply not realistic.
• The evidence is partly anecdotal. Much of the case rests on elite case studies rather than controlled trials, and head-to-head studies have not crowned threshold work as clearly superior to polarized training. It is a great system, not the one true way.

Can a normal runner use it?

Yes, in spirit. You do not need a lactate meter to borrow the core principle: do your quality work at a genuinely controlled threshold effort, and keep the rest easy. Two practical substitutes for the finger prick:

• Heart rate. Anchor your zones to your lactate-threshold heart rate and keep threshold reps in that band. Our LTHR zones calculator sets those up.
• Pace. Use a recent race to find your threshold and interval paces with the VDOT calculator, then hold the threshold pace honestly instead of racing your intervals.

The discipline matters more than the gadget. The single most common amateur mistake is running threshold sessions too hard, which is exactly what the Norwegian method is built to prevent. Try your "hard" days a touch easier and more often, and let most of your week stay genuinely easy.

For the bigger picture of how this model compares to polarized and other systems, see our guide to training philosophies.

The takeaway

The Norwegian method is not magic. It is old-fashioned aerobic training, executed with unusual discipline and a lactate meter to keep everyone honest. The pros have the time, testing, and recovery to run it to the letter. The rest of us can take the lesson that matters most: control your intensity, train the threshold often, and keep your easy days easy.