Running Plan Review Buena Vida Run Club's 16-Week Sub-3:45 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
You run about 33 miles a week on 4 days, and you want a marathon under 3:45. That's a workable base, and this plan builds the marathon on those same 4 days, peaking at 45 miles a week with an 18-mile long run. What it asks for in place of a fifth day is trust: that the easy days stay truly easy, and that one hard session a week is enough.
Jo Schoonbroodt ran a 2:54 marathon at 71, then the fastest ever by anyone over 70. "Most runners train too hard," he said after setting the record. "I do a lot of my training with groups who run very slowly. And then I build on these basics with some faster interval training."
His weeks are far bigger than this plan's, but the mix is the same: mostly easy running, with Tuesday's hard session most often a threshold run (the effort you could race for about an hour).
The run that decides this plan is Wednesday's: up to 12.5 miles, the day after the hard session. Run it at the pace you can talk at, even on mornings the legs feel fine. That is what keeps Tuesday hard and Saturday fresh.
If you want weeks of practice at goal pace, look elsewhere: this plan saves it for rehearsal, such as 5 miles inside a longer run late in the build. If your weeks sit well under 33 miles, build toward 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
A 33-mile week spread over 4 runs is a workable base for a sub-3:45 marathon, and this smart plan makes the most of it. Its hard running goes to threshold work and faster repeats, while goal pace is kept for rehearsal. Around that, most of the running is easy, Tuesday's session and Saturday's long run have 3 days between them, each session is laid out from easy warm-up to cool-down with its purpose spelled out, and the taper cuts distance while keeping some speed. A 45-mile peak week and an 18-mile long run are the right size for the race.
Two worries usually come with a plan like this. The first is that 4 days can't make a marathon. It can, when every one of the four has a clear job and the long run and the Tuesday session are never skipped. The second arrives later. By race day you will have held goal pace for only about 10 miles in total, and then the race asks for 26.2. The plan keeps goal-pace running that short on a bet. At this finish time, marathon pace sits well below threshold, and the plan trusts the threshold work and the long runs to build the fitness to hold it. No study shows race-pace work would do better, so the bet is a reasonable one. The goal-pace miles are there so the rhythm feels familiar when you need it. Coach Greg McMillan gives the same reason for goal-pace work: "your brain learns what goal pace feels like when you are fresh at the start of a run as well as when you are fatigued later in a run."
The gaps are in the climb, not the design. Weekly running jumps once, from 29 to 39 miles out of the first lighter week, and twice a new kind of hard work arrives in a growing week. The longest run arrives 5 weeks before the race, earlier than ideal. None of this is a reason to pass on the plan, only a reason to watch those weeks closely.
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Structure
Does the plan build you up smartly?
Step by step through base, build and taper, each with a clear job. The base pairs easy running with one Tuesday session and grows the long run to 16 miles, all of it easy. The build stretches the threshold run to 5 miles, adds 1000 m and 1200 m repeats at 10K pace, and brings goal pace into one long run. The taper then brings distance down over 3 weeks. The hard sessions along the way leave nothing to guess, from the first warm-up mile to the last of the cool-down.
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Prevention
Does the plan protect you from injury?
The weekly shape is sound, and the ramp is where it slips. The large majority of your running is easy, a session like week 6's 6 × 800 m at 5K pace opens with 1.5 easy miles and closes with 1.5 more, strides stay on Thursdays until race week, and strength sits on Monday and Friday. Where the plan gives ground is the ramp. The climb out of the first lighter week is steep, from 29 to 39 miles in week 5, the biggest rise in the plan. New kinds of hard work also arrive in growing weeks: the first threshold run in week 2, and 5 miles at goal pace inside an 8-mile run in week 13, straight after a cutback. Many runners first notice a niggle around weeks like these. Watch for the small things: the Achilles on the stairs in the morning, a calf that stays tight past the first mile. If an ache lingers rather than fading as you warm up, run the next 7 days easy, Tuesday's session included. Marathoner Nigel Martin knows where ignoring one leads. "I found I was able to run through it, literally for several months," he says of a niggle. "However, inevitably as it wasn't getting better, it eventually caught up with me."
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Flexibility
What happens when you miss a day?
Only two days are fixed points. Saturday's long run and Tuesday's session outrank everything, Wednesday's medium-long run comes next, and Thursday's easy run with strides is the first to let go. With 4 days, a missed run is a quarter of your week, so the rule is to protect the two key days without crowding them together. If you miss Tuesday, run that session on Wednesday in place of the medium-long run, then keep Thursday easy. Never move a hard session to Friday, the day before the long run. If you miss a long run, pick the plan up where it is rather than squeezing it into the next week. And if a busy day leaves you only 30 minutes, run 30 easy minutes. Something counts for more than you think. "Whatever the program there is no substitute for consistency," writes Mayo Clinic physiologist Michael Joyner.
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Readiness
Will the plan deliver race-day fitness?
Race-ready, from the long runs to the taper. A 45-mile peak week and an 18-mile long run fit the marathon. Longer long runs tend to go with faster marathon finishes, though no study has tested whether shorter, harder sessions could stand in for them. Goal pace gets three rehearsals, enough to learn the rhythm without spending hard running on it. The taper is a good one: distance falls over the last 3 weeks while a threshold run, 5K reps and strides stay in. Sports scientist Iñigo Mujika, a leading taper researcher, puts the rule plainly: "the training load should not be reduced at the expense of intensity during the taper." Tapering like this improves race-day performance compared with not tapering. The gap is when the long run peaks. The 18-miler comes in week 11, 5 weeks out, and the long runs after it are shorter. Treat the 16-miler in week 13 as your dress rehearsal: race-morning wake-up time, race shoes, race kit and a patient start.
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Variety
Are the workouts varied enough?
Rarely the same Tuesday twice. One week it is a steady threshold block, the next a set of 800s at 5K pace, later cruise intervals or longer repeats at 10K pace, with a hill session early and goal-pace running late. That covers both sides of threshold, a mix that tends to build endurance well: easy running underneath, with work at threshold and clearly above it. For a runner with only 4 days, it also means the one hard day a week never goes stale. The strides on Thursday are worth taking seriously. They cost almost nothing, and they give you regular, low-risk practice at running fast. Keep them quick and relaxed rather than skipping them when the week is busy.
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.
These opening days sit close to what you already run, so nothing here should feel like a leap. The aim is to fit the running into your life and learn where each day sits most comfortably. With a handful of running days, every one has a clear job, and the days off matter as much as the running. Notice how your legs feel on the morning after each run. That reading becomes useful later, when the weeks ask more of you.
M Strength Training
Tu 7mi Easy Run with 4×100m Strides
7 miles easy, with 4 × 100 m strides in the closing stretch. The plan opens with a run sized to what your legs already know. Strides are short, relaxed accelerations to a quick but controlled speed, with an easy jog or walk back between them. They teach the legs to turn over fast without strain. Keep the run itself conversational from the opening step.
W 8mi Medium-Long Run
8 miles at a steady, easy effort. This medium-long run is the plan's opening taste of extended distance. A 4-day week has no spare days for gentle jogs, so the midweek run carries a large share of the easy running. For a few days it stands as the farthest run on the calendar. Run it at a pace that lets you talk in full sentences.
Th 6mi Easy Run with 4×100m Strides
6 miles easy, finishing with 4 × 100 m strides. Thursday is the lightest day of the running week and the bridge to Saturday. Its job is to add easy running while keeping the legs fresh for the weekend. Treat the strides as quick, tall running, then jog home loose.
F Strength Training
Sa 12mi Long Run
12 miles easy. It edges past the midweek run as the longest of the plan so far. The long run is the second hard day of each week, and its difficulty comes from time on feet rather than pace. Hold one even, chatty effort throughout and finish with energy left. For now these runs grow by distance alone, a little most weekends.
Su Rest
The shape of every week is now clear. One hard effort comes early, one big day sits at the weekend, and easy running fills the gaps. That pattern holds through the whole plan, and it works because the easy days stay easy. Resist the pull to make them count for more. Pay attention to how quickly you bounce back between the harder days, because that recovery is where the running turns into fitness.
M Strength Training
Tu 7mi Threshold Run with 3mi @ Threshold
2 miles easy, 3 miles at threshold near 8:11/mile, and 2 miles easy to finish. Here the threshold strand begins. Threshold is the effort you could race for about an hour, comfortably hard with deep but controlled breathing. At your goal, marathon pace sits clearly slower than this, so threshold and goal pace are different kinds of training. The blocks grow over the coming weeks. Start this one a touch conservative and hold it even to the end.
W 9mi Medium-Long Run
9 miles at a steady, easy effort. It follows the threshold run, so the opening miles may feel heavier than usual. Let the legs come round on their own and keep the pace easy enough to hold a conversation. Distance at this effort is what carries you through the late stages of a marathon.
Th 7mi Easy Run with 4×100m Strides
7 miles easy, then 4 × 100 m strides. With a hard Tuesday behind you and the long run ahead, this run is modest by design. The strides keep a little speed in the legs during weeks built mostly on easy running. Stop each one before it starts to feel like effort.
F Strength Training
Sa 13mi Long Run
13 miles easy. The distance moves past anything you have run in the plan so far. Keep the pace relaxed enough that the closing miles feel like the opening ones. Use the run to practice small habits for race day, like loose shoulders and quick, light steps when the legs tire.
Su Rest
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Plan Strengths
- You'll put your hard running into Tuesday threshold runs and cruise intervals, with goal pace kept for rehearsal.
- Most miles are easy, and each Tuesday session comes wrapped in easy warm-up and cool-down miles, with a line on what it trains.
- The taper cuts distance while keeping a threshold run, 5K reps and strides.
- Tuesdays rotate through threshold runs, cruise intervals, hills, 5K and 10K repeats and goal-pace work, so the one hard day stays fresh.
- Peak week and longest run are the right size for a marathon on 4 days.
Weaknesses & Gaps
- Coming out of the first lighter week, weekly running jumps from 29 to 39 miles, so that is the week to go gently.
- The longest run, 18 miles, comes 5 weeks before the race, earlier than ideal.
- New hard work arrives in growing weeks: the first threshold run in week 2, and 5 miles at goal pace inside an 8-mile run in week 13, straight after a cutback.
What's missing
A few small jobs fall to you here. There is no cushion built into the week 5 climb, so add your own: trim Thursday's easy run by a mile or two if your legs are slow to come back after Tuesday. Thursday is the lowest-priority run of the week, so the cost is close to nothing. There is no tune-up race either, and no study has tested whether a tune-up makes the marathon itself any faster. Still, if holding an even pace over a long effort makes you nervous, a half marathon run at controlled effort in place of a base-phase long run can be worthwhile pacing practice, as a coaching view rather than a proven edge. Keep it to one, early enough to recover fully. Hills appear in only one session, so if your race course rolls, move a few Thursday easy runs onto hilly routes during the build.
What the science supports
Recreational marathon pace sits below threshold
Goal pace for a sub-3:45 finish sits a little easier than threshold, the pace where steady effort turns hard. That is normal for this finish time. It is why the plan leans on tempo runs slightly faster than goal pace to build the engine, while the goal-pace runs rehearse race rhythm and pacing. The two jobs are different, and the plan keeps them separate on purpose.
Jones et al. 2021; Smyth et al. 2022; Smyth & Muniz-Pumares 2020
Longer long runs go with faster marathons
The long run grows steadily and peaks at 18 miles 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. Runners commonly say these long Saturdays are where they learn how the back half of a marathon feels.
Doherty et al. 2020; Fokkema et al. 2020; Toresdahl et al. 2022
A real taper sharpens you for race day
The last 3 weeks step weekly running down from a 45-mile peak to 37, then 27 miles, then a light race week, while keeping short, quick touches in your legs. A taper of 1 to 3 weeks improves race-day performance compared with holding training. The plan keeps a little intensity through the taper rather than going fully easy, which is the shape the evidence favors.
Two strength sessions a week is enough
Strength sits twice a week from the start, on Mondays and Fridays, with the running days in between. About two sessions a week is enough for most runners to get the performance benefit of strength work, as long as the habit lasts at least 6 to 12 weeks. In pooled trials, adding more sessions did not add more. The plan keeps both slots every week until race week, well past that mark.
Blagrove et al. 2018; Balsalobre-Fernández et al. 2016; Llanos-Lagos et al. 2024
Keep easy days easy, hard days hard
With 4 running days, only Tuesday is hard. Wednesday's medium-long run and Thursday's easy run stay conversational, and the Saturday long run is easy in all but one week. Trained runners may improve more by keeping easy days truly easy and saving their intensity for a few clearly hard sessions than by running a steady stream of medium effort. It is the pattern top runners use, and a sensible default for a week this short.
Stöggl & Sperlich 2014; Casado et al. 2022; Kenneally et al. 2018
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