Running Plan Review Buena Vida Run Club's 16-Week Sub-3:40 Marathon (5 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
A sub-3:40 marathon gets decided in the last 10K. Most of the deciding happens months earlier, though, on easy days run a little too fast and hard days run a little too soft. This plan is for a runner who already trains five days a week, around 37 miles, and wants the time to come from fitness that is actually there on race morning.
The plan rests on one idea. At this goal, marathon pace sits below threshold, the effort you could race for about an hour. So the hard days go into threshold running, not into rehearsing race pace over and over. The two are different kinds of training, and threshold gets the larger share. Tuesday carries the work: continuous threshold runs that lengthen through the base, cruise intervals (the same effort broken by short jogs), and a rotation of hill repeats and reps at 5K and 10K pace to keep your stride quick. Goal pace shows up as rehearsal: a block inside one long run, a pace run of its own late in the build, and a short touch in race week.
Everything else is easy, and the easy running is doing real work. A Monday recovery run, a Wednesday medium-long run that grows past 11 miles, a strength session Thursday, an easy Friday often finished with strides, and a Saturday long run that tops out at 18 miles in the biggest week, near 50 miles. Every fourth week backs off but keeps one short session. In the last stretch the miles fall away and a little speed stays, and the legs come back.
Watch Wednesday most closely. The medium-long run comes the morning after Tuesday's session, with that work still in your legs, and its name makes it sound like something to push. Hold the first two miles at a pace you could talk through. If Wednesday stays easy, Tuesday and Saturday get to be as good as they're meant to be. If your current weeks sit well below 37 miles, build up to that first.
Below is Buena Vida's full review of the plan. We score every plan against our detailed, 30-point benchmark. Each measure is drawn from peer-reviewed sports-science research and proven coaching best practices.
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Our Review
You can chase sub-3:40 on 5 days a week without living at goal pace, and this strong plan rests on a sound idea for doing it. At this finish time, marathon pace sits well below threshold, the effort you could hold for about an hour, so threshold runs and goal-pace miles train different things. Threshold is the plan's main thread, with hill repeats and 5K and 10K reps rotating through the same Tuesday slot. Goal pace appears only three times, and you may look at that and wonder whether you've practiced the race enough. For a race pace this far below threshold, you have. The rehearsals teach you the race's rhythm, and leaning on threshold for the rest is a reasonable call, since no study shows race-pace work beats it.
The rest of the plan is put together with care. From the second week on, the pattern is one hard Tuesday, a long Saturday, and easy running between, with no two hard days side by side. Mileage climbs gently from about 37 miles to a 50-mile peak, with lighter weeks along the way, the long run reaches 18 miles, and Wednesday's medium-long run gives the week a second endurance day. The three-week taper drops the running while keeping some speed.
Two small gaps are worth planning around. The 18-miler comes five weeks before race week, so treat it as the run you don't miss. Week 13 brings the first standalone goal-pace run into one of the heaviest weeks of the build, so keep the days around it easy. It suits a runner who already handles 5 days and close to 37 miles a week, and who wants threshold work rather than long goal-pace runs to carry the build.
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Structure
Does the plan build you up smartly?
Block by block, and in the right order. A long base gives way to a shorter build and then a three-week taper, and the hard work grows patiently through all three. Threshold starts as a short continuous block, lengthens, breaks into cruise intervals, and reaches its longest run early in the build before shortening again as the plan turns toward race day. The faster reps lengthen too, from 800s to 1000s and 1200s. Each hard session sets out its warm-up, work and cool-down, and a note says what it is for.
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Prevention
Does the plan protect you from injury?
Carefully, with the hard days kept well apart. Through the build, Tuesday's session sits between a Monday recovery run and Wednesday's easy medium-long run, each session eases in with 1.5 or 2 easy miles, and the mileage build is conservative. Every fourth week is lighter, so the legs get regular relief from the climb. Where the plan gives up a little is in how two weeks stack. Week 13 puts the first standalone goal-pace run into one of the heaviest weeks of the build, and threshold first appears in the second week as the mileage rises. If a low-grade ache lingers through weeks like these, treat it as worth noticing and ease off the running for a few days rather than pushing through. The split between easy and hard running sits a little further toward easy than the ideal mix, which errs on the safe side.
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Flexibility
What happens when you miss a day?
The plan ranks its days, which makes a missed one simple to handle. Tuesday's hard session and Saturday's long run come first. Monday's recovery run and Wednesday's medium-long run come next, and Friday's easy run and Thursday's strength session are the first to give way. If you lose a day, drop from the bottom of that list and keep the hard session and the long run. Don't slide a missed Tuesday into Friday, since that puts a hard effort the day before the long run, and don't fold it into Wednesday, where it would stack on top of the medium-long run. If you miss most of a week, repeat it rather than jumping forward, and use the next lighter week to catch up on rest rather than miles.
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Readiness
Will the plan deliver race-day fitness?
The build toward race day is thorough. The peak week and the 18-mile long run fit a sub-3:40 marathon, and from the second week on there is a race-specific hard session every week. Goal pace gets rehearsed inside the first long run of the build, in a pace run of its own in week 13, and once more in race week, so the rhythm is familiar by the start. A taper that cuts the miles and keeps some speed improves race performance over training straight through, and this one keeps short reps and a goal-pace touch while the running comes down. The one soft spot is timing. The 18-miler comes five weeks before race week, and the long runs after it top out at 16. Protect it by keeping the Monday and Friday runs around it truly easy. If week 13 goes well and your legs feel fresh by Friday, you can let that Saturday's 16 grow toward 18, so your longest run sits closer to the race. If week 13 feels heavy, leave it as written.
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Variety
Are the workouts varied enough?
Week after week, something new. The Tuesday slot rarely repeats the same session two weeks running: continuous threshold runs, cruise intervals, hill repeats, 800s at 5K pace, 1000s and 1200s at 10K pace, and goal-pace runs. Around them sit recovery runs, a medium-long run, easy runs finished with strides, and a long run that once carries a goal-pace block. Each session has a clear job, and the notes on every hard day tell you what that job is, so you always know why you're out there.
Workouts
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The plan opens at the running you already do, so these days should feel familiar rather than new. That is deliberate. A runner chasing this kind of time often wants to prove fitness early, and the easy days are where that urge does damage. Let them stay easy. Consistency across the whole block matters more than any single day, and the habit starts here. Notice how the week flows from one run to the next, and keep the effort low enough that it keeps flowing.
M 4.5mi Recovery Run
4.5 miles at recovery effort, slower than a normal easy day. The plan opens at the running you already do, so nothing here should feel new. Keep the stride short and the breathing loose. Mondays in this plan follow the long run, and this one sets the tone for how slow they should be.
Tu 7mi Easy Run with 4×100m Strides
6.5 miles easy, then 4 × 100 m strides with a walk or jog back between each. Tuesday carries the hard session for most of this plan, but this one stays easy while the weekly rhythm takes shape. Strides are short pickups to a fast, relaxed pace, not sprints. Think tall posture and quick feet, and ease off each one before it strains.
W 8mi Medium-Long Run
8 miles easy, at a pace you could chat through. This midweek run opens the plan's longer efforts and becomes a weekly pillar beside Saturday. For now it is also the farthest run on the calendar, a fair check on how your base carries over. The medium-long run grows with the plan and adds endurance without the cost of another big weekend run. Hold Monday's effort and accept whatever pace it gives.
Th Strength Training
F 5.5mi Easy Run
Run 5.5 miles easy, with the long run tomorrow. Keep it gentle and finish feeling like you could have kept going. This one isn't here to build anything on its own, it's here to leave your legs fresh enough for the longer effort ahead. Slow is the right call. Save the work for tomorrow.
Sa 12mi Long Run
12 miles easy and steady from start to finish. No run so far has gone this far, yet it should still sit well inside what you can do. Long runs in this plan stay easy, and their growth is capped by time on the clock rather than by a target distance. Start slower than feels natural and let the rhythm arrive on its own. Finish with something left.
Su Rest
Something new enters the week now, and with it a different kind of tiredness. It is normal for easy days to feel a touch heavier while the body works out what the harder day asked. Let them be slow. Tiredness that fades as you warm up is ordinary. A single spot that hurts more the longer you run is not, and it is worth backing off for. Good sleep and unhurried easy days carry most of the weight here.
M 4.5mi Recovery Run
Recovery running for 4.5 miles, well under your usual easy pace. Saturday's 12 miles and a rest day sit behind you, and stiff legs that loosen as you go are normal. Tomorrow brings threshold work, so today's only job is to arrive there fresh.
Tu 7mi Threshold Run with 3mi @ Threshold
Warm up 2 miles easy, run 3 miles at threshold (8:00/mile), then cool down 2 miles easy. Threshold work starts here and becomes the main thread of the plan. Threshold is the effort you could race for about an hour. For a runner aiming at this time, marathon pace sits well below it, so the two are different kinds of training. The block should feel strong and rhythmic, never desperate. If breathing turns ragged before the cool-down, ease back to the effort and let the pace go.
W 9mi Medium-Long Run
9 miles easy, the day after threshold. Some of Tuesday may linger in the legs for the opening miles, and the effort can feel a notch higher than the pace. That is fine. Run by feel, keep it conversational, and let the distance do the work rather than the watch.
Th Strength Training
F 7mi Easy Run with 4×100m Strides
Easy 6.5 miles, finishing with 4 × 100 m strides and a full recovery between them. Saturday's 13 miles comes next, so the easy part stays truly easy. The strides keep some leg speed in a week of mostly slow running, and they cost almost nothing when kept short. Run them smooth and quick off the ground, then call it done.
Sa 13mi Long Run
13 miles easy, at a pace you could talk through. The long run steps out again, past anything the calendar has asked so far. Tuesday's threshold block may still be in the legs, and the early miles can feel flat before they open up. Hold one even effort to the finish. Any urge to press the closing stretch is a cue to hold back, because these runs build endurance at easy effort.
Su Rest
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Plan Strengths
- Built around threshold work, with goal pace kept as rehearsal, a reasonable split when race pace sits well below threshold.
- A clear weekly rhythm from the second week on: one hard Tuesday, a long Saturday, and easy running between.
- Weeks 4, 8 and 12 drop the mileage but keep one short Tuesday session, so the rhythm holds while the load eases.
- A Wednesday medium-long run that grows past 11 miles builds endurance without adding a second big weekend run.
- A three-week taper that cuts the miles and keeps a little speed and a final goal-pace touch.
- Real variety on Tuesdays, from hill repeats to 1200s at 10K pace, each with a stated purpose.
Weaknesses & Gaps
- The 18-mile long run comes five weeks before race week, and it is the only one that long.
- Week 13 introduces the first standalone goal-pace run in one of the heaviest weeks of the build.
- The mix of easy and hard running leans slightly further toward easy than the ideal balance.
What's missing
Nowhere in the build is there a tune-up race. No study has tested whether a tune-up makes the marathon itself faster, and the goal-pace rehearsals already give you race-day practice. If you'd like one anyway, a half marathon run at goal effort around the middle of the build can be a useful pacing check, as long as it's a single race and early enough to recover from. The hill work sits early in the base, so if your race course is hilly, move some of your Saturday long runs onto rolling routes through the build to get your legs ready for the climbs.
What the science supports
Longer long runs go with faster marathons
The long run is the backbone of this plan, climbing from 12 miles in week 1 to 18 in week 11. Marathoners who build longer long runs tend to finish faster, though no study has tested whether shorter, faster sessions could replace them. The steady growth here, with a 3-mile goal-pace block set inside the week 9 long run, follows that common practice.
Doherty et al. 2020; Fokkema et al. 2020; Toresdahl et al. 2022
A real taper sharpens you for race day
The plan ends with a three-week taper that brings the running down from 49 miles in week 13 to a light race week. Studies find a structured taper of one to three weeks improves race performance compared with holding training steady. Here the running comes down across those weeks while short reps and a goal-pace touch stay in.
Recreational marathon pace sits below threshold
For a 3:40 marathoner, race pace usually sits well below threshold, the effort you could race for about an hour. That gap is why the plan splits the work. The Tuesday threshold runs, growing from 3 miles to 5 by week 9, train the harder effort, while the goal-pace block in the week 9 long run and the 5-mile pace run in week 13 rehearse race rhythm.
Jones et al. 2021; Smyth et al. 2022; Smyth & Muniz-Pumares 2020
Consistent mileage is linked to fewer injuries
Weekly running builds gradually from 37 miles in week 1 to 50 in week 11, with cutback weeks in weeks 4, 8 and 12. Higher, consistent weekly running tends to go with fewer injuries rather than more, though the evidence is observational and not every study agrees. This plan's patient climb keeps the running steady from week to week, the pattern that evidence points to.
Keep easy days easy, hard days hard
From the second week on, each week holds one hard Tuesday and a long Saturday. Monday's recovery run, Wednesday's medium-long run and Friday's easy run stay conversational between them, so no two hard days sit side by side. Trained runners who keep easy days easy and save effort for a few clearly hard sessions may improve more than those running most days at a medium effort. It is the pattern most top runners use.
Stöggl & Sperlich 2014; Casado et al. 2022; Kenneally et al. 2018
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