Running Plan Review Buena Vida Run Club's 18-Week Sub-4 Marathon (4 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
Here is the odd thing about a sub-4 marathon: the pace you'll race at isn't the pace this plan trains most. For a runner chasing four hours, goal pace sits well below threshold, the effort you could hold for about an hour. Miles at goal pace teach the rhythm of race day. Threshold is a different kind of training, and this plan leans on it for the hard days.
So the hard Tuesdays here go to threshold: steady threshold runs that lengthen over the months, cruise intervals (longer repeats at that effort with short jogs between), and on other weeks faster repeats at 5K and 10K pace. Goal pace shows up as rehearsal, a stretch in the middle of a few long runs and one run of its own late in the build. Add it all up and you'll run fewer miles at goal pace before race day than the race itself asks of you. Those few miles teach the rhythm, and the threshold Tuesdays carry the main hard work of the build.
If your last marathon fell apart somewhere past 20, the instinct is to take this one more seriously, and more seriously usually sounds like harder. This plan asks for something less dramatic. Saturdays are long and easy, building to 18 miles, which is about 3 hours on your feet and the stretch where marathon long runs do their work. Wednesday is a medium-long run on legs that still remember Tuesday. Thursday is easy, with a few strides (short, relaxed pickups) at the end. Monday and Friday are strength. Every few weeks a lighter week lets the body catch up, and the taper trims the distance while keeping the speed.
Come in with a marathon behind you and about 33 miles a week already in your legs, including a 12-mile long run that feels routine.
The days that decide how it goes are the Wednesdays. The legs feel stiff for a few miles after Tuesday, then loosen, then feel good, and that's when easy drifts into steady. Watch it most in the climb out of the first lighter week, and in the week the cruise intervals and your first 16-miler land together. Keep those Wednesdays slower than feels necessary and Saturday gets your best legs.
Below is Buena Vida's full review. We grade every plan on our 30-point benchmark, built from peer-reviewed sports-science research and proven coaching best practices.
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Our Review
Sub-4 on four days a week asks you to stop treating goal pace as the main event, and if you're a marathoner ready for that, this plan fits you well. At this goal, marathon pace sits below threshold, so a goal-pace run and a threshold run are different kinds of training. The plan spends its Tuesdays at threshold instead, with 5K and 10K-pace repeats on the other weeks, and saves goal pace for rehearsal: a middle stretch inside three long runs, then an 8-mile run with 5 miles at goal pace to close the build. Around those two hard days the running stays easy, and the long run reaches two 18-milers of about 3 hours.
The structure is clean: three distinct phases, hard days never back to back, and race-specific work in nearly every week. Lighter weeks arrive in weeks 8, 12 and 17, and every hard session comes with a note on what it's for.
The one demand to meet is the early climb, where the step into week 5 is the plan's one big weekly jump and week 7 stacks three new loads together. Get through that stretch with easy days kept easy and the rest of the plan settles into a rhythm it holds to the start line.
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Structure
Does the plan build you up smartly?
Through three distinct phases: a base that introduces threshold work and stretches the long run, a build that brings the biggest weeks and both 18-milers, and a three-week taper. The hard work shifts with them, from threshold in the opening weeks to 5K and 10K-pace repeats beside it through the middle weeks. Goal pace starts to show up inside the long runs at the turn from base to build. Inside each phase the hard sessions come fully written, with a note on each one's purpose, so you start every Tuesday knowing the work and the reason for it.
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Prevention
Does the plan protect you from injury?
Yes, apart from a few early weeks where the load climbs faster than the rest of the build. Tuesday is the lone hard weekday, Wednesday's medium-long run and Thursday's short run stay easy behind it, and each Tuesday session begins with 1.5 or 2 easy miles before any work at effort. Strides sit on Thursday all the way through, and two strength days, Monday and Friday, have their own days on the calendar. Lighter weeks in weeks 8, 12 and 17 give the load a regular release, the relief a fixed plan has to build in for itself. The first threshold run arrives in a week that's also climbing. The step from the dip in week 4 into week 5 is the one big weekly jump in the plan. Week 7 then carries the heaviest load relative to the weeks before it, because three new things land at once: the first cruise intervals, an 11-mile Wednesday and the first 16-mile Saturday. It's a real step, though short of the sharp spikes most clearly tied to injury. If something starts to nag after week 7, let the lighter week 8 be lighter still until it settles. A niggle that lingers deserves attention early, not after the long run.
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Flexibility
What happens when you miss a day?
Four running days leave no spare, so protect the two that matter: Tuesday's session and Saturday's long run. Thursday is the first run to let go. Miss a Tuesday and you can run it Wednesday in place of the medium-long run, but don't do both, and don't push it to Thursday, two days before a long run. Miss a Saturday and Sunday is open, so run it then and take Tuesday a notch easier. If illness or travel takes a whole week, rejoin at that week's Tuesday session and leave the lost miles behind. A missed lighter week is the one exception worth thinking about: take the following week a little easier so the recovery still happens.
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Readiness
Will the plan deliver race-day fitness?
Ready for the distance, with the long run capped at 18 miles by design. The peak week and the two 18-mile long runs fit what a sub-4 marathon asks. At about 3 hours, those long runs sit where many coaches like a marathon long run to top out. Going to 20 would add time on tired legs that the rest of the week would have to pay for. Race-specific running is in nearly every week, threshold first and goal pace as the race gets closer, from stretches inside the long runs to the 8-mile run that closes the build and a short touch in race week. The taper runs three weeks and keeps threshold, 5K-pace repeats, and strides in. Runners who taper this way tend to race better than those who hold their training steady. You'll reach race day having practiced the pace, with the fitness underneath it that tends to make it more manageable.
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Variety
Are the workouts varied enough?
Tuesday carries most of a wide range. Tuesdays rotate through threshold runs, cruise intervals, 5K and 10K-pace repeats of 800, 1000 and 1200 meters, and a hill session, and the continuous threshold run stretches from 3 miles to 6 across the base and build. Saturdays move between easy long runs and long runs with goal pace in the middle. Wednesday's medium-long run and Thursday's easy run with strides give the rest of the week a steady shape. Every hard session spells out its warm-up, its work and its cool-down, and says what it's for, so you always know why the day looks the way it does. The variety serves the goal rather than decorating it: threshold is the backbone, and the faster repeats sharpen the top end around it.
Workouts
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Everything this week sits close to the running you already do, and that is deliberate. There is nothing to prove yet. Use these days to see how the running fits around work, sleep, and family. Pay attention to how your legs feel while they are fresh, because that sense of normal becomes a yardstick later in the plan. If it all feels easy, leave it easy and end the week keen for more.
M Strength Training
Tu 7mi Easy Run with 4×100m Strides
6.5 miles easy, then 4 × 100 m strides. Your opening run is pitched at the running you already do. Strides are brief, smooth pickups to a quick but relaxed speed, with an easy jog back after each. They teach the legs to turn over fast without strain. Hold the easy part to a pace you could chat at, and run the strides tall.
W 8mi Medium-Long Run
8 miles at an easy, steady effort. As the plan's first longer run, it sets the patient effort every longer run will share. For now it is also the farthest run on the calendar. A 4-day week has no spare days, so this midweek run carries much of the steady distance. Start gently and let the miles come to you.
Th 6mi Easy Run with 4×100m Strides
5.5 miles easy, then 4 × 100 m strides. Thursday adds easy distance between the midweek run and Saturday and asks for nothing more. If the legs feel lively, save that for the weekend. Let each stride build smoothly and ease off before it feels forced.
F Strength Training
Sa 12mi Long Run
12 miles easy. No run so far in the plan has covered this much ground. Once the Tuesday sessions begin, Saturday becomes one of the week's 2 hard days. Its hard part is the distance, not the speed. Long runs here are capped by time and stay conversational as they grow. Run the opening miles slower than you think you need to.
Su Rest
The pattern of the plan appears now, a hard day early in the week and a big day at the end, with easy running between. The easy days are easy on purpose, and that contrast is where most of the benefit comes from. Guard them against creeping faster. Notice how quickly you bounce back after the harder efforts, because that tells you more than any single day can.
M Strength Training
Tu 7mi Threshold Run with 3mi @ Threshold
A 2 mile warm-up, 3 miles at threshold near 8:46/mile, and a 2 mile cool-down. Here the plan's threshold work begins. Threshold is the effort you could race for about an hour, hard but controlled. At your goal, marathon pace sits well below that effort, and this plan leans on threshold as a different kind of work from race pace. That is why threshold fills the Tuesday slot more often than anything else. Ease into the pace over the opening minutes, then hold it level.
W 9mi Medium-Long Run
9 miles at an easy, steady effort. The day after a threshold run, the opening miles can feel stiff, and that is expected. Give the legs time to loosen before pace crosses your mind. This run builds the steady distance a marathon needs without adding a third hard day.
Th 7mi Easy Run with 4×100m Strides
6.5 miles easy, then 4 × 100 m strides. Today stays light so the legs reach Saturday fresh. The strides keep your running quick and relaxed between the harder days. Treat them as brisk rather than forced.
F Strength Training
Sa 13mi Long Run
13 miles easy. The distance moves past anything the plan has asked of you yet. Pick a pace that lets you speak in full sentences throughout. A slight slowdown in the closing miles at the same effort is normal on runs of this length, so let it happen rather than pressing. What grows over the base weeks is the distance, not the effort.
Su Rest
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Plan Strengths
- Threshold drives the plan, a sound engine for a sub-4 marathon, where goal pace sits below threshold and trains something different.
- Goal pace is rehearsed in measured doses, enough to learn the rhythm without crowding out the work that builds fitness.
- Long runs build to two 18-milers at about 3 hours and stay easy, so they add endurance without stealing from Tuesday.
- Wednesday and Thursday stay easy between the Tuesday session and the Saturday long run, so the two hard days never touch.
- Every hard session is fully laid out and says what it's for.
Weaknesses & Gaps
- The step from the dip in week 4 into week 5 is the one big weekly jump in the plan.
- Week 7 lands the first cruise intervals, an 11-mile Wednesday and the first 16-miler together, the heaviest load relative to the weeks before it.
- The first threshold run arrives in a week that's also climbing.
- The longest long run comes four weeks before race week, a little early.
What's missing
Give yourself your own buffer in the climb from week 5 to week 7, because the plan doesn't build one in. If those weeks feel heavy, shorten Thursday's easy run first, since it's the day the plan lets go of soonest. If the week still feels like too much, run week 7's cruise intervals as 2 × 2 miles instead of 3. There's no tune-up race on the calendar. No study has tested whether tune-ups make the marathon faster. If you want a pacing check, though, a half marathon at controlled effort early in the build is reasonable. It fits best in place of the long run that carries a goal-pace stretch, so the race does that run's job, with a lighter week after it to recover. Treat it as rehearsal rather than a fitness boost. Hills get one session, early in the base. If your race is hilly, take some of the Wednesday and Saturday runs over rolling ground so your legs know the climbs and the descents before race day.
What the science supports
Explosive work can make you more efficient
Thursday's easy run ends with 4 × 100 m strides (short, relaxed bursts at a quick pace) every week until race week. Strides are a cheap, low-risk way to practice running fast without adding a hard day. Trials of explosive training have found it can make distance runners more efficient, though results are mixed across reviews and strides themselves have not been tested directly.
Paavolainen et al. 1999; Turner et al. 2003; Eihara et al. 2022
Threshold or race pace: neither proven better
For most recreational marathoners, goal pace sits well below threshold, the comfortably hard effort you could hold for about an hour. That makes threshold work and goal-pace work different kinds of training. Either is a reasonable choice, and no study shows one beats the other. The plan leans on threshold: Tuesday threshold runs grow from 3 to 6 miles, and goal pace appears in just 3 long runs and 2 short Tuesday rehearsals.
Smyth & Muniz-Pumares 2020; Jones et al. 2021; Vickers & Vertosick 2016
Keep easy days easy, hard days hard
Close to 9 in every 10 miles in this plan, warm-ups included, happen at an easy, conversational pace. Tuesday carries the week's hard session, rotating threshold runs, hills and 5K or 10K pace reps, while Wednesday's medium-long run and Thursday's easy run with strides stay relaxed. Keeping easy days easy and a few days clearly hard is the pattern top runners use. It may well help you improve more than spending every run at a medium effort.
Stöggl & Sperlich 2014; Casado et al. 2022; Kenneally et al. 2018
Longer long runs go with faster marathons
The longest run climbs from 12 miles in week 1 to 18 miles in weeks 13 and 14, run at an easy, conversational pace apart from goal-pace stretches in 3 of the long runs. Building the long run this way is common marathon practice. Marathoners whose training includes longer long runs tend to finish faster, though no study has tested whether shorter, faster sessions could do the same job. The second 18-miler, 4 weeks before race day, is the closest you'll come to the marathon's time on your feet.
Doherty et al. 2020; Fokkema et al. 2020; Toresdahl et al. 2022
A real taper sharpens you for race day
Three weeks before race day, the plan cuts training volume while keeping the intensity. Week 16 still includes a 14-mile long run and your normal hard sessions but shorter. Week 17 shrinks further. Race week is mostly short, easy running and a Friday shake-out. A taper like this, with less running and the same hard efforts, improves race performance compared with not tapering.
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