Norwegian Double Threshold.
The Norwegian Model is the training system behind Jakob Ingebrigtsen, the Warholm brothers, and a generation of Scandinavian middle-and-long-distance runners who have rewritten the record books since 2018. The method centres on two sub-threshold sessions per day — a morning and an evening session — each performed just below lactate threshold, with the total threshold volume split to manage fatigue while accumulating an enormous amount of quality work.
Philosophy and origin
Developed by exercise physiologist Marius Bakken and refined by coach Gjert Ingebrigtsen, the Norwegian Model is rooted in a single physiological insight: lactate clearance capacity is the primary limiter in middle-distance and distance running from 1500m through the half-marathon. By training just below the lactate threshold in twice-daily sessions, athletes accumulate far more quality threshold volume than traditional single-session models allow — without the excessive fatigue and cortisol elevation that comes from extended threshold efforts. The method emerged from Norwegian sports science research in the 2010s and has since produced world records at 1500m, 5000m, and the 400m hurdles.
How it works
Two threshold sessions per day, typically at 82-87% of VO2max — a zone Norwegian coaches call 'sub-threshold' because it sits just below the lactate inflection point. The total threshold volume is split across two efforts: for example, 2x25min instead of 1x50min. This split keeps blood lactate manageable in each session while doubling the daily training stimulus. Between double threshold days, easy aerobic running at Zone 1 dominates the schedule. The overall intensity distribution follows a strict 80/20 polarised model — 80% easy, 20% threshold, with virtually no time in the ambiguous moderate zone.
Key workouts
The signature session is the double threshold day: a morning run of 25-40 minutes at sub-threshold pace (approximately 85-88% of max heart rate), followed by an evening run of similar duration and intensity after 6-8 hours of recovery. Rest days are truly passive. Easy days are strictly Zone 1 — no drifting into moderate effort. Long runs are moderate and aerobic (70-75% max HR), typically 90-120 minutes. Strides (6-8x100m) are included 2-3 times per week after easy runs for neuromuscular maintenance.
Who it suits
Intermediate to elite runners with an existing aerobic base of at least 50 km/week and the schedule flexibility for twice-daily running. Beginners lack the musculoskeletal resilience and recovery capacity for doubles. The method is particularly effective for 5K through half-marathon distances, where threshold pace is directly race-critical. Runners over 40 may need longer recovery between double days and should consider reducing the threshold session volume initially while monitoring adaptation.
How STRIDD builds it
Select Norwegian in the Architect. STRIDD calibrates your threshold pace from your recent race time using Riegel prediction and VDOT tables, then assigns two threshold sessions per week with progressive volume across the training cycle. Easy days fill the remaining schedule at 65-75% max HR. The plan periodises threshold volume from conservative BASE-phase doubles through aggressive PEAK-phase sessions, with recovery weeks every third or fourth week to allow adaptation.
Sample week
Monday: AM 30min threshold + PM 30min threshold. Tuesday: 50min easy. Wednesday: AM 25min threshold + PM 25min threshold. Thursday: 50min easy + 6x100m strides. Friday: rest. Saturday: 90min long run at easy pace. Sunday: 40min easy recovery. Total: approximately 70-80 km with 100-110 minutes of threshold-zone work. This structure provides two double threshold days, four easy days and one rest day per week.
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