Running Plan Review Buena Vida Run Club's 18-Week Sub-4 Marathon (3 days)
Who’s behind this review? Buena Vida is a running app made by David Cole, a Seattle runner & triathlete who led design and research for Amazon’s Halo fitness band. This is one of Buena Vida’s own plans, so we have an obvious interest in how it compares. It’s scored on the same 30 measures as every plan we review, each tied to published research, and its weaknesses are published below. AI does the first scoring and draft, then every claim is checked against its studies. No plan author pays to be reviewed, and we run no ads. See a mistake? Email David at corrections@buenavida.run · How we score →
Plan at a Glance
Three runs a week for a marathon sounds thin until you see how each one is spent. Tuesday is the hard day. Thursday is a longer easy run, finished with a few strides (short, relaxed pickups) every other week. Saturday is the long run. Monday and Wednesday hold strength, and the other two days are rest. Nothing on this calendar is filler, which is the bargain of a three-day marathon: every run has a job, and the days between give you the legs to do it.
For a sub-4 marathon, the pace you will race sits below threshold, the effort you could hold in a race lasting about an hour. So Tuesdays go to threshold, a different kind of training from goal pace. Threshold runs grow from a few miles to an unbroken 6, and between them come reps at 5K and 10K pace, a session of hills, and a couple of rounds of cruise intervals (long repeats split by short jogs). All of it runs harder than goal pace. Goal pace itself is practiced rather than chased. It turns up in the middle of a few long runs and gets one Tuesday of its own near the end of the build.
The long run is mostly easy, with those goal-pace segments tucked into a few of them. It builds from 12 miles to 18, with steps back along the way, and stops there. The biggest week reaches 40 miles, and in it the long run is 18 of them. Lighter weeks arrive every so often to let the work settle, and in the last stretch the running comes down while a little speed stays in.
It fits a runner who already covers about 27 miles across three days, with a 12-mile Saturday in the habit. Run Thursday slower than you want to. It is long enough to tempt you into running it steady and proud, and a hard Thursday turns into a tired Saturday. Keep it at the pace you can talk at, and the week holds together.
Below is the full Buena Vida review of the plan. We score every plan against our 30-point benchmark, which draws from peer-reviewed sports-science research and proven coaching best practices.
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Our Review
Bring three days a week to a sub-4 marathon and a fair worry comes with it: that three runs isn't real marathon training unless every one of them is hard. This plan trains you well for the goal and puts that worry to rest, since three runs is real training and they shouldn't all be hard. At this goal, marathon pace sits below threshold, so goal-pace running and threshold running train different things, and research hasn't crowned either one. It leans on threshold. The plan's longest unbroken stretch at threshold is 6 miles, and its longest at goal pace is 5. That is the whole idea in two numbers. Tuesdays carry the threshold work, goal pace is rehearsed in the middle of long runs, and the long run stops at 18 miles. Coaches split on whether a marathon long run needs to reach 20, and this plan sides with an easy 18 at this goal. Around that, the craft is careful: easy running dominates, hard days are kept apart, and the taper trims the miles while keeping some speed.
The gaps are small. Week 5 is the biggest rise in mileage the plan asks for, coming straight off only a small step down in week 4, and the long run peaks a touch early. Neither calls for a different plan. Run the big weeks at the effort written, and keep the 16-miler after the peak at its full distance. It suits a runner already near 27 miles a week whose life holds three runs and no more.
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Structure
Does the plan build you up smartly?
Patiently, through three clear phases (base, build, taper), each with a job you can feel. Threshold runs lead the opening weeks. From week 6, reps at 5K and 10K pace join them, and goal pace moves to the front in the last 2 weeks before the taper. You never have to guess what a Tuesday is for, because each session is written out in full with a note on its job.
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Prevention
Does the plan protect you from injury?
Yes, apart from the steep climb into week 5 and an early threshold start. Tuesday carries the only hard session of the week, two days clear of Thursday's easy run and four clear of Saturday's long run, and each Tuesday opens with 1.5 to 2 easy miles and a note on what it is for. Strides, hills and two strength days a week are on the calendar, which helps your legs handle the miles. Week 5 brings the biggest rise in weekly mileage the plan asks for, coming straight off only a small step down in week 4. Threshold running also arrives in week 2, as the mileage is rising. Run those weeks at the effort written, not above it, and if an ache is still there two days on, let the next run or two go easy.
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Flexibility
What happens when you miss a day?
With three runs a week, a missed run is a third of the week, so it helps to know the order of things. The plan ranks Tuesday's session and Saturday's long run first, Thursday second, and strength after that. Because the runs have rest days between them, most misses can slide by a day: a Tuesday session moved to Wednesday is fine as long as Thursday stays easy, and a Saturday long run can shift to Sunday. If Thursday is the one that goes, let it go. Don't fold missed miles into the next run, and if you only have 40 minutes, run 40 easy minutes and count it. After a lost week, start again from whichever Tuesday the calendar shows, not the one you missed.
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Readiness
Will the plan deliver race-day fitness?
The pieces a sub-4 marathon needs are all here. The peak week and the 18-mile long run fit the goal, and the long run reaches the range coaches usually build a marathon long run to, around 3 hours for most runners at this goal. Threshold work runs through nearly every week and grows toward the race. By the end, goal pace tends to feel like something you can hold rather than something you hope to. You also get to practice it: on tired legs in the middle of the biggest long runs, and as 5 miles of goal pace inside a Tuesday run late in the build. The last stretch brings the running down but keeps a little threshold, a few fast reps, and a short touch of goal pace. A taper like that tends to help runners race better than training straight through. One small soft spot: the last 18-miler comes a little earlier than ideal, so run the 16-miler the week after the biggest week at its full distance and at an easy effort.
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Variety
Are the workouts varied enough?
A wide spread, which matters more with only three runs a week, because Tuesday is the one day that has to keep you interested and keep you improving. It rotates through steady threshold runs, cruise intervals, short fast reps at 5K pace, longer ones at 10K pace, hills and goal-pace runs, so the hard day rarely repeats itself two weeks running. Thursday adds strides every other week, and the long runs change shape as goal-pace segments come and go. The variety has a reason behind it too: the faster reps lift your top end, and the threshold work is the main thread they support.
Workouts
Every Buena Vida training plan comes with detailed coaching notes and live workout guidance. Tap any workout to preview the notes for that day.
The plan begins at the running you already do, so nothing here should feel like a jump. The point is rhythm, settling into a week where every run has a job and the days between belong to strength and rest. Keep the effort gentle and notice how the pattern fits around the rest of your life. Fitting it in smoothly matters more than any single day.
M Strength Training
Tu 7mi Easy Run with 4×100m Strides
6.5 miles easy, then 4 × 100 m strides. The plan opens at the running you already do, so this should feel like a normal Tuesday. Strides are short, relaxed accelerations to a quick pace, each followed by an easy 100 m back. They are short, relaxed practice at running fast, for very little cost. Run the easy part at chatting pace and stay tall through each stride.
W Strength Training
Th 8mi Medium-Long Run
8 miles at an easy, steady effort. This medium-long run opens the plan's longer days and sets the unhurried tone they share. Until Saturday comes, it is also the farthest you have gone on the calendar. With only 3 runs a week, Thursday carries steady distance between Tuesday and the weekend. Keep your breathing low enough to talk in full sentences.
F Rest
Sa 12mi Long Run
12 miles easy. Saturday now moves past Thursday's distance. Long runs in this plan stay conversational and are capped by time rather than by a distance target. They grow in small steps, with lighter weekends every few weeks to absorb them. Begin slower than feels necessary and hold the same easy effort through the closing miles.
Su Rest
The week gains its harder edge, and the days on either side of it matter as much as the effort itself. Notice how your legs answer the morning after something hard. A little stiffness is normal, and it usually fades once you are moving. Guard your sleep and the rest days, because that is when the running turns into fitness.
M Strength Training
Tu 7mi Threshold Run with 3mi @ Threshold
Warm up easy for 2 miles, run 3 miles at threshold around 8:46/mile, then cool down for 2 miles. Tuesday's threshold strand starts here, with a modest dose. Threshold is the pace you could race for about an hour, comfortably hard with quick but steady breathing. At the finish time you're chasing, marathon pace sits well below that effort. Raising it is the most direct way to make 9:08/mile feel manageable. Ease into the pace over the opening minutes instead of chasing it.
W Strength Training
Th 9.5mi Medium-Long Run with 4×100m Strides
9 miles at an easy, steady effort, then 4 × 100 m strides. With the threshold run 2 days behind you, the legs should have bounced back, so the steady miles come without strain. The strides at the end remind tired legs how to turn over quickly. Keep each one smooth and stop it before it feels like a sprint.
F Rest
Sa 13mi Long Run
13 miles easy. This edges past anything the plan has asked so far. Saturday is the week's other hard day, and its difficulty comes from distance alone. Pace has no part in it, so let the watch sit in the background. If the opening miles feel sluggish after Tuesday, that usually clears within the hour.
Su Rest
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Plan Strengths
- Built around threshold, a sound choice for a sub-4 marathon, with goal pace used as rehearsal rather than the main work.
- Long runs build to 18 miles twice and stay easy apart from mid-run goal-pace segments.
- Each Tuesday session is laid out from its easy opening miles to its cool-down, with a line on what it is for.
- A taper that cuts the running but keeps threshold, 5K-pace reps and a touch of goal pace.
- A wide range of Tuesday sessions, so the one hard day each week rarely repeats.
Weaknesses & Gaps
- Week 2 brings your first threshold session as the mileage climbs, so run it at the gentle end of threshold effort.
- Your legs may feel week 5, the biggest rise in weekly mileage, coming straight off only a small step down in week 4.
- The long run peaks four weeks before race week, slightly early.
What's missing
The step down in week 4 is a small one, so if you finish week 3 feeling worn, cut that week's Thursday and Saturday runs by a couple of miles each. That gives your legs a real breather before week 5, the biggest rise in mileage the plan asks for. When life gets busy in any week, Thursday is the run that gives. Protect Tuesday and Saturday, and let Thursday shrink or go. No tune-up race takes a Saturday from the long runs.
What the science supports
Shifting training emphasis beats unchanging training
The plan is organized into three distinct phases over 18 weeks. Nine weeks build your aerobic base, six weeks of build work add 10K-pace reps and longer goal-pace segments, and three weeks of taper drop volume sharply before race day. Plans built in phases like this, moving from base to build to taper, tend to beat plans that hold the same load the whole way through, though the gain measured in trials is small.
Filipas et al. 2021; Bradbury et al. 2020; Sandbakk et al. 2025
Longer long runs go with faster marathons
The long run climbs from 12 miles in week 1 to 18 miles in weeks 13 and 14, the longest of the plan, and the second 18-miler holds 5 miles at goal pace. Marathoners who build longer long runs tend to finish faster, though no study has tested whether shorter, faster sessions could do the same. These Saturdays are where you learn what the later miles of a marathon feel like.
Doherty et al. 2020; Fokkema et al. 2020; Toresdahl et al. 2022
A real taper sharpens you for race day
The taper trims the week from the 40-mile peak in week 14 to 30.5 miles in week 16 and about 22 in week 17, and race week holds just 6 miles before the marathon. Speed stays in: a 3-mile threshold run, 5 × 800 m at 5K pace, and 2 miles at goal pace on race-week Tuesday. A taper like this, cutting volume while keeping some speed, improves race performance compared with not tapering.
Short hard intervals work when time is tight
On 3 running days a week, Tuesday is the one hard day. From week 6 it often turns to short, fast repeats: 6 × 800 m at 5K pace, then 5 × 1000 m and 4 × 1200 m at 10K pace. The other two runs stay mostly easy around it. For runners short on time, short hard intervals like these tend to improve fitness and race times, as long as they add to easy running rather than replace it.
Coates et al. 2023; Girard et al. 2018; Hostrup & Bangsbo 2023
Strength training lowers injury risk
The plan prescribes strength training on Monday and Wednesday for the first 17 weeks, bracketing your Tuesday hard run, and drops it in race week. Strength training substantially lowers sport-injury risk, more than stretching or balance work alone. A review of 25 trials found it cut injuries to about a third of what groups without it saw. In pooled trials, more strength work went with fewer injuries. The evidence is strongest in team sports and more mixed for running specifically.
Lauersen et al. 2014; Lauersen et al. 2018; Brunner et al. 2019
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