Running Plan Review Buena Vida Run Club's 12-Week Sub-1:25 Half Marathon (5 days)
Plan at a Glance
A fast half marathon is not mostly a speed problem. At this level, race pace sits just under the effort you could hold for about an hour, and the race asks you to hold it well past that hour. Most runners chasing Sub-1:25 can already run a mile at that pace without much trouble. What gives out is the ability to keep pressing once the breathing turns ragged and the legs start to argue.
The answer here is repetition at the exact rhythm. Twice a week the hard days come back to it. Repeats at half-marathon pace stretch from 0.5 mile to a full mile with short 400 m jogs between. Threshold runs at the hour effort grow to 6.8 miles. 2 race simulations put an unbroken block at goal pace into the build, so the race is something you have already rehearsed. Long runs climb from 8 to 15 miles, and an easy medium-long run follows each one, teaching your legs to keep going on a tired day.
It asks for 5 days of running and 1 strength session a week, opening at 35.6 miles and topping out at 61.3. That assumes you already run close to that opening week and recover from it well. The habit you supply is restraint on the easy days, which make up most of the miles. Keep them slow, and the hard days get your best legs.
Buena Vida's full review of the plan is below. We score every plan against our detailed, 31-point benchmark, with each measure drawn from peer-reviewed sports-science research and proven coaching best practices.
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Our Review
For a runner already close, the last minutes off a half come from patience more than heroics. Here you get 12 weeks on 5 days to find them, with Wednesday and Friday free of running. Those 2 open days are what a 5-day week buys you. The cost is that the miles pack into fewer runs, so a Monday easy run reaches 12 miles and the peak week hits 61.3.
The idea underneath is that a half is decided late, when goal pace starts to cost something. So both hard days keep sending you back to that feeling. On Tuesdays you'll run repeats at ⟦hm:6:26⟧ that stretch from 0.5 mile to a full mile. Thursdays mostly bring threshold runs that build to 6.8 miles, plus 2 race simulations, the first with 5.9 unbroken miles at goal pace. Then Sunday adds a medium-long run on legs still heavy from Saturday.
The weak spots cluster. Coming out of each cutback, the running jumps at once. It goes from 31 to 46.9 miles after the first, then climbs again the next week, and from 43 to 61.3 after the second. The 15-mile long run also goes past what a half asks. And nothing runs faster than goal pace, with strides saved for race week.
Run it if you're a competitive runner already handling about 36 miles a week, with a recent half not far off the goal. If 2 days without running help you stay healthy, this is the version to pick. Well under 30 miles a week now, build a base first.
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Structure
Does the plan build you up smartly?
3 weeks of climbing and then a lighter fourth give this build a rhythm you can feel coming. You open at 35.6 miles and reach 61.3, with the long run growing from 8 to 15. Repeat length steps up each block, from 0.5 mile to 0.75 and then a full mile. The final stretch halves the running by race week while keeping the repeats, so you reach the start rested and still quick.
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Prevention
Does the plan protect you from injury?
Mostly, though 3 weeks ask for care. Out of the first cutback, the week jumps from 31 to 46.9 miles with the first race simulation, and the next week climbs again. The second cutback rebounds from 43 to 61.3 with the 15-mile run inside it. In those weeks, trim the Monday easy run if your legs stay heavy and keep both hard days. Elsewhere, hard days never touch and each opens with a warm-up.
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Flexibility
What happens when you miss a day?
A missed Monday easy run costs the least, since the week keeps both hard days and the weekend pair. Guard the Tuesday repeats, the Thursday session, and the Saturday long run, and let Sunday's run shrink first. Don't slide a missed Thursday session to Friday, where it would crowd the long run. If illness takes a whole week, repeat it rather than jumping ahead. Beyond that, the shuffling is yours.
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Readiness
Will the plan deliver race-day fitness?
Nearly 59 miles at ⟦hm:6:26⟧ across the build make race pace something you've lived in, not guessed at. Race simulations bring 5.9 unbroken miles at goal pace early and 2.7 more close to the race. Long runs reach 15 miles 3 weeks out, past the race distance. Through the taper, the mile repeats and a short threshold run stay in place.
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Variety
Are the workouts varied enough?
In shape, yes. In speed, less so. You'll meet 10 hard-session formats that change by block, along with a progression run and 2 race simulations. Every one of them sits between threshold and goal pace, though, and strides appear only the day before the race. Strides after one Monday easy run a week would widen the range at almost no cost.
Workouts
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You picked a number that leaves very little room, and the calendar wastes no time admitting it. Both hard days are here already, sitting between easy days that have to stay easy for the week to work. Most runners at this level know the shape. The adjustment is doing it on purpose, every week, without letting the easy days drift toward the middle. The running before this built the base, and from here every week has a target. Get through these days feeling slightly underused. That is the right place to be.
M 6mi Easy Run
6 miles easy. The opening run of a block can feel like a statement, and it doesn't need to be one. Plenty of fast runners treat a day like this as a test and run it too quickly. Keep the effort low enough to talk in full sentences, because tomorrow carries real work.
Tu Intervals: 6×0.5mi @ ½ Marathon
Warm up 2 miles, run 6 × 0.5 mile at half-marathon pace (6:26/mile) with 400 m jogs between, and cool down 2 miles. Opening a block with repeats at race pace shows you right away how far the goal sits from today. At this length the pace should feel controlled, almost too easy. That is the point. The trap is treating rep 1 as a chance to prove fitness. Run every rep at the same pace, and keep the jogs slow enough that rep 6 starts with steady breathing.
W Strength Training
Th 7.1mi Threshold Run with 4.1mi @ Threshold
Warm up 1.5 miles, run 4.1 miles at threshold, and cool down 1.5 miles. A continuous threshold block this early shows where your hour effort sits right now. Threshold for you is a notch quicker than half-marathon pace, the effort you could race for about an hour. The common mistake is pressing in the opening mile while the legs are fresh. Hold the effort level, and the back half should feel like work without turning into a fight.
F Rest
Sa 8mi Long Run
8 miles easy. The opening long run of a block is less about distance than about finding the effort every later one will use. Keep it conversational the whole way, even after a week with 2 hard days in it. The pace will be slower than you think a fast runner should run, and that is fine. Tomorrow brings 6 more easy miles, so finish with something left.
Su 6mi Medium-Long Run
6 miles at easy effort. These legs ran 8 yesterday, and running tired at an easy effort is a skill the back half of the race will ask for. The opening mile often feels stiff and slow. Most runners loosen up in the second, so let the pace come to you.
The legs start to notice the rhythm now. A pair of harder days each week leaves a mark that lasts into the morning after, usually a stiffness in the opening minutes that fades once you are moving. That is normal and needs no fixing. Sleep is doing more of the work than it gets credit for. The weekend pair asks the legs to run again on a tired day, and the second morning tends to go better than the alarm suggests.
M 7mi Easy Run
7 miles easy. A Monday after a full weekend can feel heavier than the mileage suggests. Keep it relaxed and conversational, and leave the watch alone. The repeats come tomorrow, and they need you fresh.
Tu Intervals: 6×0.5mi @ ½ Marathon
Warm up 2 miles easy, then run 6 × 0.5 mile at goal pace (6:26/mile) with 400 m of jogging between, and cool down 2 miles. The same set as before, which makes it a fair test. Compare the middle reps against your memory of them. Most runners find the pace comes a little more naturally on the second go, with less checking of the watch. Use that ease to tidy up form: relaxed shoulders, quick feet, and an even effort through each rep.
W Strength Training
Th 8.5mi Threshold Run with 4.5mi @ Threshold
Warm up 2 miles, run 4.5 miles at threshold, and cool down 2 miles. The block is a little longer than the one before, and the extra distance shows up late. Run the opening mile slightly under the effort you think you can hold. What this tests is patience. The closing mile at threshold should match the opening one, not outrun it.
F Rest
Sa 9mi Long Run
9 miles easy. It is the longest run of the block so far, one mile past the one before. Keep the effort conversational from start to finish. Somewhere past halfway, most runners notice the pace creeping up with no change in how hard it feels. Let that happen only if the breathing stays easy. Otherwise ease back, because tomorrow asks for 6 more.
Su 6mi Medium-Long Run
6 miles at easy effort, the second half of the weekend. Legs that ran 9 miles yesterday tend to feel flat for a while, and that is normal. It usually lifts once the blood is moving. Keep it slow enough that Tuesday's repeats still get your best legs.
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Plan Strengths
- You'll know ⟦hm:6:26⟧ by feel, after repeats that stretch from 0.5 mile to a full mile across the build.
- Fresh legs for every hard day, because Wednesday and Friday carry no running and hard days never sit side by side.
- By late in the build you'll hold threshold for 6.8 miles, so the middle of the race feels familiar.
- Sunday morning, legs still heavy from the long run, is where the medium-long run teaches you to keep pressing.
- The taper keeps mile repeats and a short race simulation, so you arrive rested without feeling rusty.
Weaknesses & Gaps
- Heavy legs are likely in the 3 weeks after cutbacks, as running jumps from 31 to 46.9 miles and from 43 to 61.3.
- Your first race simulation arrives on top of that first jump, so 5.9 miles at goal pace meet legs still adjusting.
- Extra fatigue rides on the 15-mile long run, which goes past what a half marathon calls for, with 10 more miles next morning.
- Without any running faster than ⟦hm:6:26⟧, your legs have little in reserve when the closing mile asks for a push.
- You'll miss the quick turnover strides give, since they appear only in the shake-out before the race.
- Left on your own for strength, you get a 30-minute Wednesday slot that never changes across the build.
What's missing
Most of what's missing is easy to add on your own. After each cutback, cut 3 or 4 miles from the Monday easy run. If your legs feel heavy, run the first race simulation as a threshold run. If 15 miles feels like more than you need, stopping the long run at 14 gives up little for a half. Add 4 to 6 strides, short relaxed bursts of about 20 seconds, after one Monday easy run in each build week. Midway through the build, swap one Tuesday of repeats for 5 or 6 × 1000 m at 10K effort. Your legs then touch a pace above race rhythm. For Wednesday strength, bring a routine you already trust or ask a coach for one that gets harder as the weeks go.
What the science supports
Keep easy days easy, hard days hard
Runners improve more when easy days stay truly easy and hard days are clearly hard, rather than running everything at a medium effort. A randomized trial and a review of elite training both point this way. Here the 2 hard days sit on Tuesday and Thursday, with Wednesday free of running between them. Monday's easy run and the weekend pair stay conversational, so each hard session meets legs that can push.
Stöggl & Sperlich 2014; Casado et al. 2022; Kenneally et al. 2017
Easy miles do most of the work
Among trained distance runners, 75 to 85 percent of the running goes at an easy, conversational effort, and that base carries the harder work. About 79 percent of this plan's 528 miles are easy by distance. Long runs, medium-long runs, and Monday easy runs make up that share. So even a 61.3-mile peak week is mostly slow running with 2 hard sessions on top.
Haugen et al. 2022; Casado et al. 2022; Tønnessen et al. 2014
Threshold speed is built by running
Your threshold, the pace where steady running tips into hard, rises when you train it by running at that pace. Cycling or rowing keeps you fit but doesn't move running threshold the same way. In this plan, Thursday threshold runs grow from 4.1 to 6.8 miles, all on foot. For a half raced just under threshold, that running shows up in the middle miles.
A taper makes you 2-6% faster on race day
A planned taper of 1 to 3 weeks improves race times by 2 to 6 percent compared with training straight through. The trick is to run less while keeping some fast running. Over the last 3 weeks, your running drops from 49.3 to 41.7 to 30.4 miles, about half the peak. Mile repeats at goal pace and a short race simulation stay in, so your legs remember the rhythm.
Recovery weeks turn training into fitness
A lighter week every few weeks lets built-up fatigue clear so recent training can sink in. A trial in recreational runners found this beat adding miles every week, for both progress and injury risk. You get 2 of these here, each after 3 weeks of climbing. Both hard sessions drop out, leaving only easy running, and the long run steps back to 7.5 and then 10 miles.
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