Living 100K Training Protocol

Publication clarification — 22 September 2026: Session durations, progression percentages, downhill doses and the traffic-light thresholds below are practical planning examples, not validated injury-prevention rules or an individualized prescription. Adapt them to prior training and recovery; none is a target every runner must reach. Carbohydrate amounts are rehearsal examples rather than a minimum or a requirement to maximize intake. Clinical symptoms override the training plan.

Version: 1.2
Baseline date: 25 August 2026

This is a training framework, not medical care. It should be updated from actual training response, race date and terrain, rather than from formulas alone.

Evidence rules for future updates

Evidence & limitations

• Robust: supported by multiple controlled studies, a sound meta-analysis, or a consensus that fits the athlete and event.
• Probable: consistent mechanistic and observational evidence, but limited 100K-specific trials.
• Early: small trials, preprints, case studies, or expert hypotheses. Track these; do not make them default practice.
• Change a protocol only when evidence is applicable and the expected benefit outweighs fatigue, injury, gastrointestinal, or adherence costs.

Intensity anchors

Evidence & limitations

Use breathing, talk test and RPE as the primary controls; heart rate is a secondary cross-check because heat, hills, fatigue and fueling alter it.

*When no validated threshold measurement is available, use RPE and the talk test, with heart rate as a secondary trend across comparable sessions. Do not use MAF 180-age or nasal breathing as a physiological threshold or substrate-use proxy.

Weekly architecture

Evidence & limitations

Keep approximately 80–90% of running time easy. Pyramidal and polarized distributions can both work; current evidence does not establish one universal winner. Default to a pyramidal week because it is practical for 100K preparation: much easy running, some steady/threshold running, and little very hard running.

Do not add a second hard running session until this structure is consistently absorbed.

Four-week loading loop

Evidence & limitations

1. Week 1 — establish: repeat a load already known to be tolerable.
2. Week 2 — build: add roughly 5–8% time or climbing if recovery is green.
3. Week 3 — specific: hold total load or add a small amount; lengthen the long run or add a back-to-back, not both aggressively.
4. Week 4 — absorb: reduce running time about 20–30%; retain a few strides and light strength.

Progress is conditional, not automatic. Hold or reduce load if morning fatigue, easy-run RPE, sleep, pain, or mood worsens for several days. Avoid treating a fixed “10% rule” as evidence-based protection.

Quality-session rotation

Evidence & limitations

Choose one per week during normal build phases:

• Threshold intervals: 3 × 8–10 min at controlled threshold effort, 2–3 min easy; progress to 2 × 15–20 min.
• Uphill aerobic intervals: 5–6 × 4–5 min at RPE 7, jog/walk down; strong form, no straining.
• Steady specificity: 45–75 min continuous at RPE 4–5 on terrain resembling the target race.
• VO₂ maintenance: every 2–3 weeks, 5 × 3 min at RPE 8–9 with 3 min easy, replacing—not adding to—the weekly quality session.

The 100K goal is durable submaximal output. High intensity is a small supporting dose, not the center of the plan.

Long-run and durability protocol

Evidence & limitations

• Build long-run duration before chasing pace. Most long runs stay easy.
• Progress toward 3–5 hours depending on terrain, history and total weekly load. Very long rehearsals are occasional because their recovery cost is high.
• Use a controlled back-to-back every 2–3 weeks during the specific block, for example 3–4 hours Saturday plus 60–120 minutes easy Sunday.
• Practice hiking steep climbs early; do not wait until running becomes impossible.
• Pace by sustainable effort and protect the opening third of the run. An overly ambitious early pace can contribute to fatigue and late-race slowing; the importance of muscle damage depends on terrain and the athlete.

Downhill durability

The ultra-specific evidence increasingly points to eccentric muscle damage as a major limiter, but the “main limiter” claim remains an expert hypothesis rather than a settled hierarchy.

1. Start with 6–10 minutes of accumulated gentle descending once weekly.
2. Add about 5 minutes every 1–2 weeks only when soreness resolves within 24–48 hours.
3. Progress toward 20–40 minutes of accumulated descending inside long runs, matching target terrain.
4. Use short steps, stable trunk and controlled speed. Avoid hard downhill work close to the race.

Strength and plyometric protocol

Evidence & limitations

Strength training can improve running economy and some endurance outcomes, though certainty and applicability vary; a VO₂max increase is not consistently demonstrated.

Base/build: twice weekly

• Squat or split squat: 3–4 × 3–6 repetitions
• Deadlift pattern or hip thrust: 3 × 3–6
• Calf raise, straight and bent knee: 3 × 6–10 each
• Step-down or single-leg squat control: 2–3 × 6–8 each side
• Row or pull plus trunk anti-rotation/carry: 2–3 sets

Use heavy but technically clean loads, leaving about 2 repetitions in reserve. Reduce volume before key long runs.

Plyometric microdose: once or twice weekly after an easy warm-up

• 2–3 sets each of 10–20 low pogo contacts, 4–6 bounds per side, and 4–6 short hill accelerations.
• Stop when stiffness, landing quality or coordination degrades.
• Build contacts slowly; plyometrics are omitted during pain flares or high-fatigue weeks.

Specific/taper phases

• Reduce to one strength-maintenance session weekly.
• In the final 10–14 days, use light neural maintenance only; avoid soreness.

Running-technique protocol

Evidence & limitations

• Default cue: tall, relaxed, quiet, and quick enough that the foot lands naturally under the moving body.
• Do not impose a universal cadence such as 180 steps/min.
• If there is clear overstriding, recurrent knee/tibial symptoms, or braking, test a 5% cadence increase for short easy segments and reassess comfort, pain and economy. A 5–10% increase reliably changes mechanics, but long-term injury prevention and performance benefits remain uncertain.
• Keep technique work short: 6–10 minutes within an easy run, not a separate fatiguing workout.
• Strides and short hills are the default economy drills because they preserve natural self-organization at speed.

Fueling and hydration protocol

Evidence & limitations

Training

• Runs under about 75–90 minutes easy: fuel according to normal meals and comfort; there is no need to force intake.
• Key sessions over 90 minutes: rehearse carbohydrate delivery rather than routinely training depleted.
• Long runs: begin around 50–60 g carbohydrate/hour if well tolerated, then progress by 5–10 g/hour across sessions toward a practical race range of 60–90 g/hour using mixed carbohydrate sources.
• Record planned versus actually consumed grams per hour; athletes commonly overestimate intake.
• Test one variable at a time: dose, product, concentration, texture, timing, heat, or intensity.

Race rehearsal

• Start fueling in the first 20–30 minutes and use small frequent doses.
• Choose the highest intake that remains comfortable and repeatable for the expected race duration; more is not automatically better.
• A 120 g/hour target is not part of the default protocol. A 2025 crossover study in eight elite male marathoners found higher carbohydrate oxidation and lower oxygen cost at 120 versus 60–90 g/hour, but gastrointestinal symptoms were common and performance benefit was not tested.
• In heat, expect greater carbohydrate use and potentially lower gut tolerance. Rehearse heat-specific fueling and hydration rather than copying a cool-weather plan.
• Individualize fluid from weather, thirst, observed sweat loss and aid-station access. Avoid both large untested deficits and drinking enough to gain body mass. Do not copy an elite athlete’s fluid or sodium intake from a case study.

Recovery nutrition

• After key or long sessions, eat a carbohydrate-rich meal plus a normal high-quality protein serving within roughly two hours, especially when the next session is within 24 hours.
• Daily energy availability and adequate carbohydrate around demanding work matter more than any single recovery product.

Recovery protocol

Evidence & limitations

• Target a consistent 7–9 hour sleep opportunity; extend it before the race or major simulation when practical.
• Place the hardest sessions after the best sleep opportunities.
• Use easy movement, food, fluids, sleep and load reduction as defaults. In a 2026 network meta-analysis of competitive and elite endurance athletes, no physical recovery modality reliably outperformed passive recovery for soreness, biomarkers or sport-specific performance; most comparisons were low or very-low certainty.
• Recovery methods are optional and their effects depend on the outcome and comparison. Cold-water immersion has some evidence for short-term soreness recovery; this does not establish better ultra-race performance or long-term training adaptation. The earlier blanket wording about no performance-recovery benefit was too broad. See the dated editorial correction below.
• After a major ultra-specific simulation, resume structured intensity only when easy running mechanics, sleep, appetite and soreness are near baseline.

Daily traffic light

Phase map

Evidence & limitations

Durations depend on the race date and present load. The next personalized version needs current weekly distance/time, elevation, longest recent run, injury status, target race/date/terrain and available training days.

Baseline protocol changelog

Evidence & limitations

28 August 2026 — version 1.2

• Removed the inferred preference for MAF-style and nasal-breathing training from the athlete context.
• Removed the MAF-derived easy heart-rate guide and nasal breathing as an intensity anchor.
• Replaced them with RPE, talk test and an individually measured or repeatable field-calibrated ventilatory/lactate threshold; heart rate remains a secondary trend.
• Made explicit that protocol choices follow scientific evidence and objective training response rather than assumed coaching-method preferences.

28 August 2026 — version 1.1

• Corrected the recovery section after adding an overlooked 18 August 2026 systematic review and network meta-analysis of 16 randomized trials (273 competitive/elite endurance athletes).
• Made passive recovery fundamentals the explicit default and reclassified cold-water immersion, compression, active recovery and similar modalities as optional comfort tools without demonstrated sport-performance recovery benefit.
• Preserved the caution against routine cold-water immersion after strength training.

25 August 2026 — version 1.0

• Established a pyramidal default while allowing a polarized variant; recent individual-participant meta-analysis found no universal superiority and suggested training status may modify response.
• Added heavy strength plus low-volume plyometrics for economy and durability.
• Added progressive downhill exposure, labeled as probable rather than settled evidence.
• Kept cadence manipulation conditional; biomechanical effects are clearer than long-term injury or performance effects.
• Set default long-run fueling progression at 50–60 toward 60–90 g/hour; classified 120 g/hour as early evidence only.
• Added heat-specific fueling rehearsal because heat and dehydration increase carbohydrate use.
• Added sleep extension before key events as a low-risk practice; ultra-specific evidence remains heterogeneous.

Key evidence base

Evidence & limitations

1. Rosenblat MA et al. (2025). Training-intensity distribution network meta-analysis. https://pubmed.ncbi.nlm.nih.gov/39888556/ (opens in a new tab)
2. Ramos-Campo DJ et al. (2025). Strength training and endurance determinants: umbrella review. https://pubmed.ncbi.nlm.nih.gov/40153564/ (opens in a new tab)
3. Llanos-Lagos C et al. (2024). Strength methods and running economy: systematic review/meta-analysis. https://pubmed.ncbi.nlm.nih.gov/38165636/ (opens in a new tab)
4. Tiller NB, Millet GY (2025). Muscle damage as an ultramarathon limiter: current opinion. https://pubmed.ncbi.nlm.nih.gov/39405022/ (opens in a new tab)
5. Figueiredo I et al. (2025). Cadence, biomechanics and injury prevention: systematic review. https://pubmed.ncbi.nlm.nih.gov/40964543/ (opens in a new tab)
6. Mougin L et al. (2025). Heat, dehydration and carbohydrate use: systematic review/meta-analysis. https://pubmed.ncbi.nlm.nih.gov/40835807/ (opens in a new tab)
7. Ravikanti S et al. (2025). 60 vs 90 vs 120 g/hour carbohydrate crossover study. https://pubmed.ncbi.nlm.nih.gov/41191077/ (opens in a new tab)
8. Guilherme LQ et al. (2026). Sleep in ultra-endurance: systematic review. https://pubmed.ncbi.nlm.nih.gov/41753086/ (opens in a new tab)
9. Mougin L et al. (2026). Western States 100 elite case study. https://pubmed.ncbi.nlm.nih.gov/41334713/ (opens in a new tab)
10. Moore E et al. (2023). Cold-water immersion recovery meta-analysis. https://pubmed.ncbi.nlm.nih.gov/36527593/ (opens in a new tab)
11. Jin Y et al. (2026). Physical recovery modalities in competitive and elite endurance athletes: systematic review and network meta-analysis. Published 18 August 2026. https://doi.org/10.3389/fspor.2026.1876924 (opens in a new tab)

Shared-edition correction — 21 September 2026

Evidence & limitations

The cold-water recovery paragraph has been corrected after checking the Moore et al. primary abstract. This is a dated editorial correction to the shared edition; the original protocol snapshot remains v1.2. Acute recovery and long-term adaptation are different questions. Full-text and health-risk review remain outstanding. Source: https://pubmed.ncbi.nlm.nih.gov/36527593/ (opens in a new tab)