Marathon Threshold Builder

Workout - Marathon Threshold Builder

• 15min @ 6'00''/km
• 4 lots of:
  • 1.0km @ 5'00''/km
  • 2min rest
• 15min @ 6'00''/km

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Intro: here’s what to know from This Messy Happy’s video on How Long Should Normal Runners Train for Marathons? Worth watching in full. The core takeaways are below so you can start using them today.

Key points:

• An undulating schedule (alternating run days) prevents back-to-back runs and fits busy schedules.
• Start with four runs a week: Tuesday (intervals), Thursday (easy run), Saturday (easy run), and Sunday long run. The weekend pair are non-negotiable.
• Build the long run to a peak of roughly 20 miles (35 km) or around 3 hours, then drop by ~10% each week after the peak. These sessions are also test runs for nutrition, gear, shoes, and pre-race meals.
• Tuesday intervals take many forms (lactate-threshold, marathon-pace, tempo, speed work), but the rule is the same: run faster than target race pace at least once a week.
• Easy runs should feel truly easy. You can talk. Don’t confuse it with zone-2 training. It’s low-stress aerobic distance.
• In the build block (weeks 9 to 15), add a fifth training day (aerobic work or an extra run) and shift Thursday to a marathon-pace session. Long runs can include marathon-pace intervals (3 × 3 km or 3 × 4 km stretches) with easy-paced recovery jogs.
• Keep Friday as a complete rest day so you recover before the weekend’s back-to-back efforts.
• On hot days, shift easy runs to a treadmill or find a cooler route. Comfort and recovery come first.

Workout example (base block, weeks 1 to 8):

• Monday: mobility and bodyweight drills (pilates ball, mobility work).
• Tuesday: interval session, e.g., 4 × 1 km at lactate-threshold pace with 2-minute easy jogs between (or marathon-pace repeats if you’re already in that phase).
• Wednesday: strength day. Deadlifts, squats, or similar gym training.
• Thursday: easy run at conversation pace, 30 to 45 minutes.
• Saturday: easy run at the same pace, 30 to 60 minutes based on fitness.
• Sunday: long run, starting at 10 km and building to about 20 miles (or 3 hours). Once you hit peak distance, trim around 10% the following week. Use these runs to dial in race-day nutrition, test shoes and clothing, and practice pre-race meals.

Build block (weeks 9 to 15) adjustments:

• Add a fifth run day (Wednesday): aerobic cross-training like cycling, or another easy run.
• Shift Thursday to a marathon-pace effort: roughly 6 to 8 km at target race pace, then an easy jog.
• Sunday long run now includes marathon-pace intervals: 3 × 3 km plus 3 × 4 km at goal pace, with easy-paced recovery segments.
• Friday stays a complete rest day.

Closing note: use this structure and fine-tune paces with the Pacing app.

References

• How Long Should Normal Runners Train for Marathons? - YouTube (YouTube Video)