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Practical guide

12-week half marathon training plan: 3 days a week

A complete 12-week half marathon plan with three runs per week, readiness checks, effort guidance, strength options and rules for missed sessions.

Updated Aug 27, 2026

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The plan at a glance

This 12-week plan uses three runs per week: one controlled quality session, one easy run and one long run. It is for runners who can already run easily for about 30 minutes and complete 60 minutes of easy run/walk without unusual next-day fatigue.

Three days is a scheduling choice, not a shortcut. Keep at least one non-running day between the quality session and long run. Optional strength or low-impact aerobic work should support the runs, not compete with them.

Effort guide

  • Easy: conversational; you could speak in full sentences.
  • Steady: controlled and purposeful; never a time trial.
  • Tempo intervals: comfortably hard repetitions with easy jogging between them.
  • Strides: 15–20 seconds fast but relaxed, with full recovery.
  • Long run: mostly easy; use planned run/walk intervals if that keeps effort stable.

12-week schedule

Minutes include warm-up and cool-down. Move the days to fit your week while preserving recovery between harder sessions.

WeekRun 1Run 2Long runDecision for next week
135 min easy + 4 strides30 min easy60 min easyRepeat if 60 minutes disrupts the next two days
26 × 2 min steady, 2 min easy35 min easy70 min easyKeep the same load if easy pace stops feeling easy
33 × 6 min tempo, 3 min easy35 min easy80 min easyProgress only with normal sleep and recovery
430 min easy + 4 strides30 min easy65 min easyTreat this cutback as training, not lost work
54 × 6 min tempo, 2 min easy40 min easy90 min easyPractise the breakfast and fluids you can repeat
68 × 90 sec hill or steady, easy jog down40 min easy100 min easyUse flat steady reps if hills aggravate anything
73 × 8 min tempo, 3 min easy45 min easy105 min easyKeep the finish easy if recovery is marginal
835 min easy + 5 strides35 min easy80 min easyCut back without adding makeup intensity
92 × 12 min at controlled half-marathon effort, 4 min easy45 min easy110 min easyRehearse race fuel and clothing; do not race the run
103 × 10 min at controlled half-marathon effort, 3 min easy40 min easy120 min easy, cappedStop at 120 minutes even if distance is short
114 × 5 min tempo, 3 min easy35 min easy + 4 strides85 min easyBegin tapering; extra fitness cannot be crammed in
1230 min easy + 4 strides20–25 min very easyRace dayStart controlled and use the plan you rehearsed

Strength and cross-training

One or two 20-minute strength sessions can fit after an easy run or on a separate day. Use familiar movements for calves, hips, hamstrings and trunk, leaving repetitions in reserve. An optional easy bike, swim or walk is useful only when it leaves you fresher, not depleted.

When to repeat or step back

Repeat the current week or reduce the long run when fatigue changes your gait, soreness escalates as you run, or normal recovery has not returned before the next key session. Do not diagnose pain from a schedule; stop and seek qualified care for concerning or persistent symptoms.

A missed session is not debt. If you miss one run, leave it missed. Protect the next long run only if you are recovered. If you miss a full week, resume with the last week you completed comfortably instead of jumping ahead.

Put the plan on your calendar

Use the 12-week half marathon plan for more variants, or download a half marathon plan PDF or CSV. For day-to-day adjustments based on completed work and recovery, start training with 26weeks.

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Open the plan and tool that match this guide

Worksheet

Use this before you choose

Place the three runs

  • • My quality-session day is: ____
  • • My easy-run day is: ____
  • • My protected long-run day is: ____
  • • The first session I will remove during a high-stress week is: ____

Checklist

Check your choice

Readiness check

  • • I can run easily for about 30 minutes.
  • • I can complete 60 minutes of easy run/walk without unusual next-day fatigue.
  • • I can protect three running windows most weeks.
  • • I will keep recovery days between the quality session and long run.
  • • I will repeat a week rather than force progression through escalating pain or fatigue.

Race rehearsal check

  • • I have practised breakfast, fluids and fuel on long runs.
  • • I know the official start, course and cutoff rules for my race.
  • • My race shoes and clothing have already worked in training.

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FAQs

Can I train for a half marathon by running three days a week?

Yes, if three runs match your current capacity and you can recover between them. This plan protects one quality session, one easy run and one long run rather than compressing a higher-frequency plan.

Is this plan for complete beginners?

No. Build to roughly 30 minutes of easy running and a 60-minute easy run/walk first. A new runner may need a longer runway before beginning week one.

What should I do if I miss a run?

Leave it missed. Do not stack sessions or add intensity to repay it. Resume the next planned run if recovered, or repeat the week after a longer disruption.

Should I add strength training?

One or two short, familiar sessions can support durability when they do not compromise the three runs. Start conservatively and avoid unfamiliar heavy work near the long run.

Keep going

Half Marathon Training Plan PDF (Free Download)

Download a free half marathon training plan as a PDF and CSV. Choose 10–20 weeks, optionally add a race date, and get a printable week-by-week summary.

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Training Start Date Calculator: Count Back From Race Day

Enter a race date and plan length, see the start date, then check whether the opening week matches your current training readiness.

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12-Week Half Marathon Plan: Readiness and Weekly Priorities

Use a 12-week half marathon plan with a current running base, protected key sessions and practical missed-week rules.

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Sources