Marius Bakken
Runner and physician
Originated the “Norwegian” double-threshold method: two lactate-controlled threshold sessions in a day, governed by frequent blood-lactate testing. Built largely from his own self-experimentation; later adopted by the Ingebrigtsen brothers and a wave of sub-elite runners.
Marius Bakken is a Norwegian former international 5000 m runner who became a physician. His lasting influence is methodological rather than from his racing: he developed the framework now known as the Norwegian method, in which two sub-threshold sessions are run on the same day and intensity is policed by frequent blood-lactate measurement rather than by feel or pace (Bakken).
The system has three signatures: controlled double-threshold volume kept deliberately below the lactate turn-point; a readiness scheme keyed to lactate and heart-rate values; and the muscle tone concept, managing muscular stiffness through light explosive work. It grew out of his own n-of-1 experimentation, thousands of lactate tests on himself, which is both its origin story and a caution: the underlying threshold-and-volume principles are well grounded, but the specific protocol rests on elite case examples rather than controlled trials. It connects directly to lactate testing and the wider question of guiding training by heart rate and effort.