The Physiology of Endurance Running Podcast Sirpoc - the creator of the "Norwegian Singles Method"
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Jun 4, 2025 James (Sirpoc), a runner and online coach who turned a cycling background into a 2:24 marathon debut, explains the Norwegian singles framework. He recounts switching from cycling, early mistakes, finding a sustainable sweet-spot intensity, and using HR and lactate proxies. Short sessions, strict intensity control, and patient progression are highlighted with practical session examples and marathon prep tips.
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From Time Trials To Running After Crashes
- James moved from time-trial cycling to running after crashes and four years off, starting in 2021 with a 28-minute 5K he ran alone as a self-test.
- His cycling background shaped a problem-solving approach and helped him rapidly apply sweet-spot ideas to running.
Sweet Spot Threshold As The Training Spine
- The core idea is sustainable repeatable sub-threshold sessions combined with very easy runs so you can do stimulus multiple times per week.
- James replicated cycling sweet-spot in running by targeting paces that produce ~2–3 mmol·L−1 lactate as a practical proxy.
Small Intensity Overshoots Cause Exponential Fatigue
- Excess intensity creates exponential next-day fatigue so tiny overshoots compound into chronic under-recovery.
- James warns against 'getting greedy' in reps because occasional overcooking erodes long-term consistency.