Running Plan Review Buena Vida Run Club's 18-Week Sub-3 Marathon (6 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
You've probably been told that marathon pace should feel comfortable. For most marathoners it does, because their race pace sits well under threshold. At sub-3 it doesn't. Your goal pace sits close to threshold, the effort you could race for about an hour, so the miles you spend rehearsing the race are some of the hardest training you'll do.
Most weeks hold two hard days. Tuesday carries the work, moving between threshold runs, goal-pace runs that stretch to 8 miles, hill repeats, and faster repeats at 5K and 10K effort. Saturday is the long run, climbing to an easy 22, and a few of the biggest Saturdays carry a block of goal pace in the middle, so you learn the race rhythm on legs that already have miles in them. Wednesday is the run that decides how the rest goes: a medium-long run the day after the hard session, reaching 15 miles. Your legs will be heavy and the watch will show a slower number than you'd like, and your job is to let it. Through the build, that's the back half of the marathon, practiced week after week.
Everything else is easy, and it should be easier than you think. Monday is a recovery run, Sunday is for strength, and in the build Thursday turns hard a few times, never the day after another hard session. Every fourth week or so is a cutback that keeps one short, brisk session so the rhythm never leaves. The last stretch brings the running down while threshold, short repeats and strides keep the legs quick.
It's built for runners already covering about 54 miles a week with a marathon behind them, and the biggest week reaches about 73. If you'd rather have a rest day between harder sessions, the 5-day version is the better fit.
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 already train like a marathoner, 6 days a week, and the next goal is a race under 3 hours. This plan gives you what that goal needs. At sub-3, goal pace sits close to threshold, and most coaches count running there as threshold work as well. So the Tuesday threshold and goal-pace runs, and the goal-pace blocks inside a few late long runs, train that effort and rehearse the race at once. Everything around them stays easy, slow enough to talk through. The build is patient, climbing from about 54 miles a week to a 72.8-mile peak, with the 22-mile long run in that same week, four weeks out. Both land where a sub-3 marathon needs them, and the taper keeps the legs quick. The gaps are small: a shade more easy running than the usual mix, and a Wednesday medium-long run that asks for discipline on legs still heavy from Tuesday. Run it as written, and keep Wednesday slow.
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Structure
Does the plan build you up smartly?
Step by step, with each block given its own job. The plan runs nine weeks of base, six of build and three of taper. Threshold carries the early weeks, and faster repeats at 5K pace take a short turn in the middle of the base. Then goal pace joins threshold through the build, and the last weeks before the taper bring faster repeats back in. You'll know exactly what each hard session asks, since every one is written out in full with a note on its purpose.
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Prevention
Does the plan protect you from injury?
Every hard day gets an easy day or strength on each side. In the three weeks when Thursday turns hard, Wednesday's easy medium-long run sits between it and Tuesday, and Friday's easy run between it and Saturday. All 20 hard sessions get an easy warm-up of 1.5 or 2 miles before any work begins, and even the peak week doesn't spike the load against the weeks before it. Cutbacks let fatigue clear before the next climb, and higher mileage built up gradually like this is linked to lower injury risk, not higher. The plan's one gap is balance: it keeps a shade more of its running easy than the usual mix. That gives up a little speed work, but it doesn't add injury risk. What's left to you is keeping the easy days easy, Wednesday above all.
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Flexibility
What happens when you miss a day?
The plan tells you what to protect. Tuesday's hard session and Saturday's long run come first, along with Thursday's session in the three build weeks where it turns hard. Wednesday's medium-long run and Monday's recovery run come next, and Friday's easy run, along with Thursday's in the weeks it stays easy, drops first. Each hard session carries a note explaining its job, so when a week goes sideways you know what you're saving and why. Miss an easy day and carry on. Miss a key session and move it to the next easy day, as long as that doesn't put two hard days together. If you need a full day off, take it in place of an easy run, never a key session. And if Wednesday leaves your legs flat in one of those double-hard build weeks, Thursday is the hard session to let go.
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Readiness
Will the plan deliver race-day fitness?
This is where the plan earns its goal. The peak week and the 22-mile long run land together, four weeks before the race, at the volume and distance a sub-3 marathon asks for. Race-specific work runs from the second week to race week: threshold runs that grow from 4 miles to 7, goal-pace runs from 3 miles to 8, and three late long runs (weeks 9, 13 and 15) with 6 to 8 miles at goal pace in the middle. Then the running comes down over three weeks while a threshold run, 800 m repeats and strides keep the legs quick. Stepping down from 59.5 miles to 43.2 and then to about 11 before the race, with those quick touches intact, is the kind of taper that tends to show up as a better race than training straight through.
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Variety
Are the workouts varied enough?
The range is wide, and Tuesday carries most of it. Tuesday rotates through threshold runs, cruise intervals of 3 × 2 miles, goal-pace runs, 8 × 200 m hills, and repeats from 800 m to 1200 m at 5K and 10K pace. Long runs stay mostly easy, with goal pace added to a few of the late, big ones, and Wednesday adds a medium-long run. Strides close many Friday runs, a cheap way to keep short, fast running in your legs. Every pace is set as an effort that scales to your own fitness.
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 base starts with distance and rhythm rather than speed. Most days are easy, one weekday run stretches longer, and Saturday is the biggest day of the week. This is the pattern the whole plan keeps, with two hard days a week and everything else easy enough to support them. For now even the harder slots are gentle. The aim is to get used to running most days without dragging tired legs into each run.
M 6mi Recovery Run
6 miles at recovery effort. Monday is the recovery slot in this plan, the day after each long run, so its only job is to loosen the legs. Opening the block with a gentle run sets the tone for how easy the easy days should stay. Keep the pace conversational and let your breathing set the speed.
Tu 8.5mi Easy Run with 4×100m Strides
8 miles easy, then 4 × 100 m strides with 100 m of easy jogging after each. Tuesday carries the hard session in most weeks, and here it holds only strides. Each one is fast but relaxed, well short of a sprint. Run them on flat ground and jog until your breathing is easy before the next one.
W 11mi Medium-Long Run
11 miles at an easy, steady effort. Wednesday is the medium-long run in this plan, a second long aerobic day that climbs toward 15 miles in the build. Long aerobic days start here, and soon they become an ordinary part of the week. It is also the furthest the plan has asked you to go so far. Keep the effort even from start to finish, because the point is steady running rather than pace.
Th 8mi Easy Run
Easy running for 8 miles. Thursday stays easy through the base, and in 3 build weeks it becomes a short second hard day. Keep it truly gentle so Saturday gets your best legs.
F 8mi Easy Run
An easy 8 miles. Friday comes the day before the long run, so the aim is to arrive on Saturday fresh rather than to bank extra running. If the legs feel heavy from Wednesday, slow down and let the effort stay small.
Sa 13mi Long Run
13 miles easy. Saturday is the long run, and it climbs from here toward an easy 22 miles late in the build. Later on, a few long runs carry a block at 6:49/mile in the middle, so the base puts the distance in place before any pace joins it. No run in the plan so far has gone this far. Hold a pace you could talk through, and finish feeling you had a few more miles in you.
Su Strength Training
Faster running joins the week, and the shape of the plan becomes clear. One weekday asks for sustained hard effort, Saturday stays long and easy, and the days around them keep you fresh enough for both. Expect the legs to feel the difference by the weekend. That heaviness is normal at this stage and fades as the base goes on. Keep the easy days easy, because they are what make the hard days possible.
M 6mi Recovery Run
6 miles of recovery running. The day after the long run calls for the softest effort of the week, slower than you think you need. Stiffness at the start is normal, so give the legs time to loosen before you judge how they feel.
Tu 8mi Threshold Run with 4mi @ Threshold
Warm up 2 miles easy, run 4 miles at threshold, then cool down 2 miles. Threshold is the effort you could race for about an hour, close to 6:32/mile for a runner chasing this goal. This starts the threshold strand, the Tuesday session that grows longer through the base and lifts the pace you can hold before the marathon gets hard. Most runners find the opening threshold run teaches more about pacing than about fitness. Start the block a touch conservative and aim to finish it at the same pace you began.
W 12mi Medium-Long Run
12 miles, steady and easy. This medium-long run comes the day after threshold work, so it teaches you to run long on legs that are not fully fresh. That is the feeling the marathon brings in its back half. Keep the effort conversational for the full distance and resist pressing in the closing miles.
Th 8mi Easy Run
8 miles, all of it easy. Thursday stays easy while the base is being laid, which keeps two hard days a week from turning into three. Run by feel and ignore the watch unless it tells you to slow down.
F 8.5mi Easy Run with 4×100m Strides
8 miles easy with 4 × 100 m strides at the end, jogging 100 m after each. With Tuesday's threshold run behind you and 14 miles on Saturday, the strides keep the turnover quick at no real cost. Stay loose through the shoulders and let each stride build rather than burst.
Sa 14mi Long Run
14 miles at an easy effort. The long run grows steadily through the base, with distance coming before any pace work joins it. It is a step past every long run in the plan so far. Take the opening miles slower than feels natural. Let the pace drift up only if the effort stays easy, and keep your form tall as the legs tire.
Su Strength Training
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Daily coaching notes, nutrition guidance, reschedule logic, and strength placement.
Plan Strengths
- Goal-pace work comes as regular race rehearsals, so the pace you hold on race day is one you have run many times in training.
- A Wednesday medium-long run of up to 15 miles, the day after the hard session, trains you to run well on tired legs.
- The build is patient, with 4 cutback weeks that ease the running before each next climb.
- The taper cuts the miles but keeps threshold, short repeats and strides, so quick running stays in the week right up to the race.
Weaknesses & Gaps
- It leans a shade more toward easy running than the usual mix. Outside the three build weeks where Thursday turns hard, Tuesday is the only hard weekday and just three long runs carry goal pace.
- Wednesday asks for discipline. After a hard Tuesday, 13 to 15 miles on heavy legs will feel slow, and pressing it back to your usual pace turns it into a third hard day in a week built for two.
- There's no on-ramp: the first week already sits at about 54 miles, so a runner coming up from lower mileage needs to build there before starting.
What's missing
Missing from the calendar is a tune-up race. No study has tested whether tune-ups make the marathon faster. If you want pacing practice, run one race in place of an early-build long run, hold goal effort rather than racing all out, and run the following Tuesday easy instead of its session so your legs can recover. It also has no cross-training swap for days a niggle keeps you from running. Cycling can stand in for an easy run or two, and once you can run pain-free, bring the Tuesday sessions back first.
What the science supports
Longer long runs go with faster marathons
Your long runs climb from 13 miles in week 1 to 22 miles in week 14. Three Saturdays put race-day fatigue and race-day pace into one session: the week 9 18-miler holds 6 miles at goal pace, week 13's 20-miler holds 8, and week 15's holds 6, each with easy running after. Marathoners who train with longer long runs tend to finish faster, though no study has tested whether shorter, faster sessions could replace them.
Doherty et al. 2020; Fokkema et al. 2020; Toresdahl et al. 2022
Shifting training emphasis beats unchanging training
The plan divides into three named phases, and the work shifts in each. The base, weeks 1 to 9, climbs from 54.5 to 67.8 miles a week while Tuesday rotates threshold runs, hills, goal-pace runs and 5K reps. The build, weeks 10 to 15, stretches goal-pace runs to 7 and 8 miles and turns Thursday hard three times. The taper sheds volume while holding one fast day a week. Planned shifts like these tend to beat flat, unchanging training, though the gain measured in trials is small.
Filipas et al. 2021; Bradbury et al. 2020; Sandbakk et al. 2025
A real taper sharpens you for race day
The final three weeks step volume down from the 72.8-mile peak to 59.5, then 43.2, then about 11 miles of running in race week. The taper keeps one Tuesday session each week and trims the long run from 16 to 10 miles. You'll feel restless and undertrained by Friday of race week, which is the right feeling. A taper of up to 3 weeks that cuts volume but keeps some intensity improves race performance compared with not tapering.
Keep easy days easy, hard days hard
Six running days sit on a simple frame: Tuesday carries the session and Saturday the long run, while Monday's recovery run, the Wednesday medium-long run, Thursday and Friday stay easy. Only in weeks 10, 13 and 14 does Thursday turn hard. About 90% of the running lands at easy effort. Trained runners who keep easy days truly easy and hard days clearly hard may improve more than those who run everything at a medium effort.
Stöggl & Sperlich 2014; Casado et al. 2022; Kenneally et al. 2018
Mix easy and hard instead of steady medium
Rather than running most weeks at a steady moderate effort, this plan rotates formats on Tuesday: threshold runs, hill repeats, goal-pace runs, and reps such as 6 × 1000 m at 5K pace and 5 × 1200 m at 10K pace. Friday strides and plenty of easy running fill the gaps. For trained runners, this mix may build endurance a little better than long stretches of steady, moderate-hard running, though recent reviews find the edge is small.
Stöggl & Sperlich 2014; Rosenblat et al. 2019; Casado et al. 2022
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