Sample 4-Day Marathon Training Week Base to Taper

Search for a 4-day marathon plan and you'll mostly find forum threads and bare PDFs — isolated principles, not an actual week you can follow. Here's the full picture: one long run, one speed or tempo session, and two easy or recovery runs, every week from base through taper. What changes phase to phase is the distance and workout content inside each session — base, build, peak, and taper, laid out in full below.

Most runners on this schedule didn't choose it as a strategy — work, kids, or an old injury chose it for them. The risk is bolting together a week that feels fine in isolation and only discovering at mile 20 that the sequencing was off. I've coached runners through exactly this constraint, and what separates a 4-day week that holds up from one that breaks down always comes down to how the four sessions are spaced and loaded against each other, not how many of them there are.

Base Phase (Weeks 1-4): Building the Frequency Habit

Total weekly mileage: roughly 20-25 miles. I keep the two non-running days near the long run fully protected as rest, not filled with cross-training, at this stage — on a 4-day structure, recovery capacity is your limiter early on, not fitness. Adding cross-training before the base is established just blunts the running-specific adaptation you're there to build.

Build Phase (Weeks 5-9): Adding Load Without Adding Days

Total weekly mileage climbs to roughly 30-38 miles. This is the core differentiator from generic mileage-building advice: volume and intensity climb while the run count stays fixed at four. Monday becomes the one day that can absorb optional cross-training — see what to do on your non-running days for the full pairing guide — while the other rest days stay fully rest.

I coached a time-crunched runner through exactly this structure to a finished marathon — four sessions a week, nothing more, because that's genuinely all his schedule allowed. It's not a compromise plan; done properly it's a complete one.

Peak Phase (Weeks 10-13): The Highest-Load Weeks

Total weekly mileage: roughly 38-45 miles — the realistic ceiling on a 4-day structure, per the mileage-ceiling comparison at how high your mileage can realistically go on 4 days. Sequencing matters most here: keep at least two easy or rest days between the long run and the quality session. There's no third recovery run on a 4-day plan to buffer a bad sequencing choice, so this spacing does that job instead.

Taper Phase (Weeks 14-16): Winding Down on 4 Days

For exact session-by-session taper prescriptions rather than a general shape, see the full taper guidance and exact taper-week workout structure — those cover taper mechanics in depth so I won't duplicate them here.

Not sure 4 days is right for you in the first place? See is 4 days a week right for you for the decision framework before committing to this structure.

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