Peaking sample plan
12-Week Marathon Training Plan
A marathon in 12 weeks at intermediate level: 5 training days, peak 70 km, key long run 32 km. Periodization Base (Weeks 1–4), Build (Weeks 5–8), Peak (Weeks 9–10), Taper (Weeks 11–12). Reference paces 6:12 /km easy / 5:27 /km race. The overview and week 9 come from the same engine Peaking uses for paid plans.
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Start freeA 12-week marathon plan for intermediate runners. Peak week 70 km, key long session 32 km, 5 training days. Peaking periodization: Base → Build → Peak → Taper.
- Peak week
- 70 km
- Key long
- 32 km
- Days / week
- 5
- Race pace
- 5:27 /km
- Easy
- 6:12 /km
- Tempo
- 5:00 /km
- Intervals
- 4:48 /km
Week-by-week overview
Weeks 1–4
Base
Aerobic volume, easy running, and a durable long run. Intensity stays mostly conversational.
Weeks 5–8
Build
Threshold and race-pace work land on top of the base. Long run stretches toward its peak.
Weeks 9–10
Peak
Highest quality + highest fatigue. Race-specific sessions, then a down week before taper.
Weeks 11–12
Taper
Volume drops 40–60%. Keep a little intensity so you stay sharp, then race.
| Wk | Phase | Focus | Volume |
|---|---|---|---|
| 1 | base | Aerobic consistency | 54 km |
| 2 | base | Growing the long run | 55 km |
| 3 | base | Easy economy | 55 km |
| 4 | base | Settling-in week | 56 km |
| 5 | build | Threshold + long run | 66 km |
| 6 | build | Race-pace work | 66 km |
| 7 | build | Quality on volume | 67 km |
| 8 | build | Loading week | 67 km |
| 9 | peak | Peak specific load | 70 km |
| 10 | peak | Controlled down week | 70 km |
| 11 | taper | Taper — short quality | 39 km |
| 12 | taper | Race week | 30 km |
Sample week 9
Peak specific load · 70 km
Week 9 (peak): keep 6:12/km honestly easy. Quality lives at 5:27/km. If the long run feels heavy, cut 10% — don't add a day.
Mon
Rest
Tue
running
Marathon-pace session
99 min · RPE 6
- Warm-up15 min6:12/km
- Race pace3×3 km5:27/km · 90s jog
- Cool-down10 min6:12/km
Wed
running
Easy run
50 min · RPE 3
- Warm-up10 minEasy Z1
- Main set8 km6:12/km
- Cool-down5 minWalk / jog
Thu
running
Tempo / threshold
62 min · RPE 6
- Warm-up12 min6:12/km
- Tempo2×12 min5:00/km · 2 min jog
- Cool-down8 min6:12/km
Fri
Rest
Sat
running
Long run
198 min · RPE 4
- Easy19 km5:58/km
- Finish at race pace8 km5:27/km
- Float5 km6:12/km
Sun
running
Recovery
50 min · RPE 2
- Warm-up10 minEasy Z1
- Main set8 km6:12/km
- Cool-down5 minWalk / jog
Who this plan is for
intermediate level, 5 days, peak 70 km. If that describes your current week ±20%, this block fits. Peaking then asks for real availability, injuries and PBs; this preview is the skeleton for the query “12-Week Marathon Training Plan”.
How the weeks are periodized
Weeks 1–4: Base — Aerobic volume, easy running, and a durable long run. Intensity stays mostly conversational. Weeks 5–8: Build — Threshold and race-pace work land on top of the base. Long run stretches toward its peak. Weeks 9–10: Peak — Highest quality + highest fatigue. Race-specific sessions, then a down week before taper. Weeks 11–12: Taper — Volume drops 40–60%. Keep a little intensity so you stay sharp, then race. Volume doesn't climb in a straight line: each phase has its own wave, plus a down week before taper. Peak load 70 km. Week 9 (preview below) sits at peak quality.
Race pace inside the long run
The key long run reaches 32 km. For marathon/half, build and peak weeks finish a segment at 5:27 /km after easy kilometres at 6:12 /km. Weekly tempo lives near 5:00 /km. 5 days: if you miss one, you cut an easy run, not the long run.
What the marathon punishes (and the plan covers)
The last 12 km are not trained by hammering a half. They're trained with 32 km long runs, sustained glycogen (practice gels from ~km 8 of the long run), and holding 5:27 /km when the legs are no longer fresh. This block's taper cuts ~40–60% of volume and keeps a short race-pace stimulus. Super shoes: optional on quality days; the plan doesn't depend on them.
From this preview to a plan that's yours
The preview is anchored to “12-Week Marathon Training Plan”: 5 days, 70 km, 5:27 /km. At signup Peaking preloads distance (marathon), 12 weeks and intermediate level. The live engine then asks for PBs, available days and constraints, and regenerates whole weeks — not a static PDF. The CTA below opens registration with those fields and this page's UTMs.
Generate your personalized 12-week marathon plan
We preload distance, weeks and goal. Start free — the engine builds the plan from your PBs and real days.
Start freeFrequently asked questions
Is this 12-week marathon a generic plan?+
The overview and week 9 come from Peaking's periodization composer (same phases and session types as an in-app plan). It's persisted per slug — it doesn't change on every visit. The paid plan personalizes from your PBs and real days.
How many kilometres / hours per week does it peak at?+
Peak 70 km, key long session 32 km, 5 days. Base weeks sit well below that; the taper (Weeks 11–12) cuts volume and keeps short quality.
What pace should I use if my mark isn't 3:50:00?+
This preview anchors race to 5:27 /km, easy to 6:12 /km and threshold to 5:00 /km. In the app, paces come from your PBs or a Riegel predictor — don't copy these splits if your current 10K sits at a different level.
Can I skip days or squeeze this into fewer than 12 weeks?+
Skip an easy day, never the long run or both quality sessions in the same week. Compressing 12 → 8 often works if the base is already there; the hub lists other durations for this marathon.
How do I go from this page to a plan generated for me?+
Start free preloads marathon, 12 weeks and intermediate. You finish onboarding (sports, PBs, days) and the engine builds the full plan. This URL stays as the SEO reference; your plan lives on the dashboard.