Photo by RUN 4 FFWPU on Pexels
You’ve downloaded three PDFs, bookmarked two Instagram carousels, and now you have a spreadsheet open comparing “Hal Higdon Novice 2” against “Hansons Beginner” against something a running YouTuber swears by. None of them quite fit. One assumes you can run five days a week. Another has you doing hill repeats on a Tuesday when you have a 7am client call. A third promises a sub-4 marathon off 16 weeks and you’re not sure you believe it, and honestly, you’re not sure you want to.
This is the actual problem with marathon training plans: almost all of them are written for an imagined runner who doesn’t have your job, your kids, your dodgy knee, or your actual running history. The plan isn’t wrong — it’s just not built for you. Picking the right one isn’t about finding the “best” plan. It’s about matching a plan’s demands to your real week, honestly assessed, before you’ve convinced yourself you’ll somehow find extra hours in March.
This article will walk you through how to do that — using your weekly mileage capacity, your schedule, your injury history, and your goal, in that order. Not the other way round.
Start with your life, not the finish time
Most runners pick a plan based on their goal time, then try to bend their life around it. Flip that. Start with how many days you can realistically run, most weeks, for 12–20 weeks straight — accounting for the fact that life doesn’t pause for marathon training.
Be blunt with yourself here. If you have two young kids and a job with unpredictable hours, “five runs a week, every week” is not realistic even if it’s technically possible on your calmest week. Count your actual available days, then subtract one for buffer. That’s your real number.
| Realistic weekly running days | Plan style to look for |
|---|---|
| 3 days | Low-frequency, higher-intensity plans (e.g. FIRST method, 3-run marathon plans) |
| 4 days | Most beginner-to-intermediate marathon plans, including our own 16-week marathon training plan for beginners |
| 5 days | Standard intermediate plans (Hal Higdon, Hansons-style) |
| 6+ days | Advanced plans with doubles or higher weekly volume — usually unnecessary for a first or second marathon |
Three days a week can absolutely get you to a marathon finish, including a respectable one. It just needs to be structured differently — longer, more purposeful runs rather than lots of easy junk miles. Don’t assume fewer days means a lesser result; it means a different shape of training.
Match the plan to your running history, not your ambition
Plans are usually labelled “beginner,” “intermediate,” or “advanced,” but those labels mean almost nothing without context. What they’re actually asking is: how much of a base do you already have?
A genuinely useful way to self-assess: can you currently run 8–10km continuously, 3 times a week, without it wrecking the rest of your week? If yes, you’re ready for a beginner marathon plan. If you’re closer to running 20–30 minutes a few times a week, you need a few weeks of base building before you start a structured plan — not because you’re not capable, but because jumping straight into a 16-week plan from a low base is where most injuries come from.
If you’ve run a half marathon in the last year and can handle 30–40km weekly without issue, you can look at intermediate plans with tempo runs and marathon-pace segments built in. If this is your first marathon full stop, resist the urge to pick a plan because it has an impressive-sounding name. The 16-week beginner plan exists for a reason — it’s not a lesser version of the “real” plan, it’s the appropriate one.
Be honest about your injury history
This is the part most runners skip, and it’s the part that decides whether you make it to the start line at all. If you’ve had Achilles issues, shin splints, or a hamstring strain in the past 12 months, the plan you pick needs built-in recovery weeks and a slower mileage ramp — not a plan that increases long runs by 3-4km every single week with no cutback.
Look specifically for:
- Cutback weeks — every 3rd or 4th week, mileage should drop by 20–30%, not just hold steady
- Rest days that are actually rest, not “optional cross-training” that becomes mandatory in practice
- A gradual long run progression — ideally no more than a 10% increase week-on-week, with the occasional flat or reduced week
If you’re currently managing something like Achilles tendinopathy or recovering from a hamstring strain, the honest answer may be: delay the marathon by one cycle rather than force a plan that doesn’t account for it. A marathon you run healthy in six months beats one you limp through — or don’t start — in sixteen weeks.
Understand what the plan is actually asking of your week
Plans differ wildly in weekly structure, and this is where the spreadsheet comparison actually pays off. Look past the day-by-day schedule and ask three questions:
- What’s the longest single session, and when does it peak? Some plans peak at 32km three weeks out; others go to 35km+ with only a two-week taper. If your weekends are unpredictable (shared custody, shift work, family commitments), a plan with a fixed long-run day every Sunday may not survive contact with your actual life.
- Does it include quality sessions you can realistically do alone, outdoors or on a treadmill? A plan built around track intervals assumes track access. If you’re running from home in the dark at 6am, fartlek-style sessions — which don’t need precise pacing or a track — tend to translate better. Fartlek training is worth understanding properly before you dismiss a plan for being “too unstructured.”
- How much does a missed week actually cost you? Rigid 16-week spreadsheets can make one bad week (illness, work crunch, a kid off school) feel like the whole plan is ruined. Flexible plans — or ones you’re willing to adapt — survive real life better than perfect-on-paper ones.
Compare plan structures side by side
Here’s a structural comparison of the three most common marathon plan types, stripped of brand names, so you can match the shape to your actual week rather than a marketing pitch.
| Plan type | Days/week | Best for | Watch-outs |
|---|---|---|---|
| High-mileage, low-intensity | 5–6 | Runners with time and an existing base; chasing a specific finish time | Time-hungry; higher injury risk if base is weak |
| Moderate mileage, structured quality | 4 | Most first and second-time marathoners with jobs and families | Requires discipline on easy days — don’t turn them into moderate efforts |
| Low-frequency, high-intensity (3-run) | 3 | Busy schedules, older runners, those prioritising injury prevention | Each session matters more; less room for a “bad” long run |
None of these is objectively superior. The “best” marathon plan is the one whose weekly shape you can actually sustain for 12–20 consecutive weeks without rearranging your entire life around it.
Build in your own buffer before you commit
Once you’ve shortlisted a plan, do one more thing before you start: identify your known disruptors for the training block. Half-term, a work deadline in week 9, a wedding in week 12. Mark them on the calendar now, and decide in advance how you’ll adapt — swap long run days, repeat a week, or accept a lower-mileage week without panicking.
Runners who build this flexibility in from day one tend to finish training blocks. Runners who treat the plan as a rigid contract tend to either overtrain trying to “catch up” after a missed week, or quietly give up around week 6 when the first disruption hits. Cross-training — cycling, swimming, the elliptical — is also worth factoring in as a genuine substitute for a missed run, not just a nice-to-have, especially if niggles are part of your history.
If you’re still torn between committing to a full marathon or something shorter first, it’s worth reading up on how the half marathon compares as a stepping stone — the training demands and injury risk are meaningfully different, and for a lot of runners the half is the smarter first goal.
According to NHS guidance on exercise, gradual, consistent increases in activity are safer and more sustainable than large jumps in training load — which is really the whole argument for picking a plan that matches your actual capacity rather than your ambition.
The Honest Takeaway
- Count your real available running days first, subtract one for buffer, then find a plan built around that number — not the other way round.
- Match the plan’s starting mileage to your current base, not your goal time. If you can’t comfortably run 8–10km three times a week right now, spend 3–4 weeks base building before you start the clock.
- Check for cutback weeks and a sane long-run progression (no more than ~10% increase weekly) — especially if you’ve had any injury in the past year.
- Mark your known disruptors on the calendar before week 1 and decide now how you’ll adapt, so one bad week doesn’t become the reason you quit in week 7.
- Pick the plan you can actually finish, not the one that sounds most impressive. A completed 3-day plan beats an abandoned 6-day one every time.
Next read: Not sure if the half is a better first step?