Build Block: Classic Tempo
Workout - Build Block: Classic Tempo
- 15min @ 6'00''/km
- 22min @ 5'00''/km
- 12min 30s @ 6'15''/km
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Quick summary
Here’s a breakdown of How Long it REALLY Takes to Train for a Marathon (And How) from This Messy Happy. The main takeaways are below so you can use this approach right away. Watch the full video for context and examples.
Key points
- Your purpose shapes the plan. Treat the marathon as a process goal (building a sustainable running lifestyle), not a one-off achievement.
- Structured training blocks: organize into 4-week phases. Three weeks of building stimulus, then one week of recovery. The final phase has three weeks to build fitness, followed by a three-week wind-down.
- Alternating daily rhythm: every-other-day running, with an easy long run on the weekend, mid-week aerobic work, and one weekly tempo or threshold session. Fill non-running days with strength and mobility.
- Respect prescribed mileage. Follow the distances closely rather than consistently exceeding them (a 23 km long run stays around that). Measured progression lowers injury risk.
- Recommended duration: runners whose longest run is 10 to 12 km and whose mid-week efforts sit at 5 to 10 km benefit most from an 18-week window.
Sample 18-week structure (weeks 1 to 18)
| Phase | Weeks | Focus |
|---|---|---|
| Base block 1 | 4 | Easy aerobic runs, 1-2 short strides, strength work |
| Base block 2 | 4 | Add occasional lactate-threshold runs (7-8/10 effort) |
| Build block 1 | 4 | Increase long-run distance (up to 20-23 km), keep tempo run at marathon/half-marathon pace |
| Build block 2 | 3 | Peak volume, longest long run (≈25 km), sharpen tempo |
| Taper | 3 | Reduce mileage by ~30-40%, keep a short tempo to stay sharp |
Typical week (during a build block)
- Mon: rest or light strength/conditioning
- Tue: easy run 6-8 km (zone 2, conversational pace)
- Wed: rest or cross-training
- Thu: tempo run 8-10 km at 7-8/10 effort (marathon pace if racing, otherwise comfortably hard)
- Fri: rest or easy 5 km + strides
- Sat: easy run 6-8 km
- Sun: long run 20-23 km easy (zone 2, time on feet)
Adjust distances to your current mileage and the paces you can sustain.
Practical tips
- Keep a training log and compare your actual runs to what’s prescribed.
- If you miss a workout, move on to the next session rather than squeezing in the missed run.
- Don’t skip recovery weeks. That’s when the body adapts.
- For tempo or threshold work without a target race pace, use the 7-8/10 effort scale.
- Add strength and mobility work on non-running days to prevent injury.
Closing note
Follow this 18-week plan. Adapt paces with the Pacing app to your abilities. One marathon doesn’t define your running. Keep building on what comes next.