8 Sources & background
8.1 How this guide uses sources
This is a practical community guide. Original accounts explain how people developed and used the method; individual reports describe their experience. Research helps clarify terminology and limits, but does not establish that every example here is an optimal schedule.
The week tables and complete session time budgets are editorial examples. They apply the described structure and make the arithmetic explicit. They are not quotations from a book, and shorter or larger versions are adaptations. Exact instructions from a named source should be read with that source’s population, training volume, and purpose in mind.
8.2 The singles approach
- Original LetsRun thread: Modifying the Norwegian approach to lower mileage. The discussion that this project originally summarized. Read the author of each post; replies and quotations are not all sirpoc’s advice.
- Sirpoc on easy running, post #170. His use of maximum heart rate as a guide for easy days.
- Sirpoc on repetition pace and recovery, post #231. An example of his short-recovery practice.
- Sirpoc on heart-rate response, post #450. Context for controlled starts and interpreting the whole session.
- Sirpoc on weekly balance, post #478. Easy and quality time discussed in relation to his own volume.
- Sirpoc on scaling workouts, posts #562, #563, and #571. Approximate pace estimates and repetition durations for different runners.
- James Copeland, Norwegian Singles Method: Subthreshold Running Kept Simple, with a foreword by Marius Bakken. A book reference for readers who want the author’s account. The full paid text was not used to verify the examples in this revision.
Links point to the relevant forum page, with post numbers supplied to help locate the passage. The repository also retains the original scrape under data/ and its intermediate summary under intermediary/ as historical material.
8.3 Norwegian training background
Marius Bakken’s original account describes the development of his lactate-controlled training, including individual differences in threshold readings. His 2026 article on double threshold provides further context. These are the author’s accounts of practice, not controlled trials of this guide’s singles week.
His book, The Norwegian Method Applied, covers threshold training and intensity control. An online preview provides sample pages.
The translated and annotated Kristoffer Ingebrigtsen description at Running Writings is another account to read alongside the original discussion. It is a translation with commentary, and should not be treated as Copeland’s identical prescription.
8.4 Tools and community resources
- LacTrace Norwegian Singles pace guide: the starting pace tool linked from the session instructions.
- The Norwegian single approach: an existing community summary.
- Training calculator spreadsheet: an existing community planning resource; check its assumptions before comparing totals.
- Sub-threshold summary website: another community explanation.
- Strava group and r/NorwegianSinglesRun: discussion and personal experiences.
- TrainingPeaks Performance Manager explanation: definitions and assumptions behind its load model.
- Suunto ZoneSense FAQ: the manufacturer’s description of input requirements and response delays.
Community questions help identify gaps in the instructions. A success story, fatigue report, or secondhand book quotation does not establish a new universal rule. This guide does not adopt an exact higher-volume quality percentage from an unverified book passage.
8.5 Research background
These references support the optional explanations. They do not prescribe the week tables.
- Analysis of the factors influencing the proximity and agreement between critical power and maximal lactate steady state: a review of measurement differences relevant to the power discussion.
- Effect of Strength Training Programs in Middle- and Long-Distance Runners’ Economy at Different Running Speeds: a systematic review and meta-analysis for readers considering strength training.
- 2023 IOC consensus statement on Relative Energy Deficiency in Sport: background on problematic low energy availability. Its abstract informed the brief recovery guidance; the website is not a diagnostic guide.
8.6 Other training approaches
The comparison chapter uses the publisher’s description of Daniels’ Running Formula, the Lydiard Foundation, Pfitzinger Coaching’s FAQ, Palladino’s coaching page, and 80/20 Endurance’s intensity explanation. These short comparisons do not replace their full plans.