I missed my long run in marathon training — what now?

The coach answer · Updated July 10, 2026

Don't try to make it up by cramming. Either shift the week forward — slide the long run a day or two and push the next hard session back — or let it go entirely and resume the plan as written. What you must not do is stack the missed run on top of this week's existing sessions: three hard days in a row to make a spreadsheet whole again is how training blocks end early.

Missed miles aren't debt

A missed session is information about your week, not a debt to repay. The training effect of a marathon block comes from the accumulation of consistent weeks, not from any single run — one missed long run in a 16-week block is statistical noise if you handle it calmly.

The damage comes from the repayment attempt: squeezing the long run into Thursday, keeping Friday's tempo, then racing into Saturday's next long run. Back-to-back-to-back hard days multiply fatigue right before the sessions that matter most.

The decision in practice

Ask two questions: how close is the race, and why did you miss it?

  • Missed for life/logistics, race far away: shift the week 1–2 days, resume normally.
  • Missed for illness or deep fatigue: let it go completely — the miss was your body voting.
  • Race under 3 weeks away: let it go. The fitness is already banked; the taper matters more.
  • It keeps happening: the plan doesn't fit your life — the schedule needs restructuring, not heroics.

Source: The ECSS/ACSM consensus statement on overtraining (Meeusen et al., 2013) is explicit that non-functional overreaching typically follows errors in the balance of load and recovery — exactly what compressed catch-up weeks create.

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Educational content, not medical advice. If something hurts (rather than aches), or symptoms persist, see a professional.