05Training
A calm twelve weeks towards a half marathon in spring
Three springs running, a handful of us have built towards a half marathon without changing very much about the weeks in between. This is what that build looks like, what we deliberately leave out of it, and what the last fortnight is actually for.
9 min readWritten 2 March 2026Revised 15 Jun 2026Kaunas
What calm means in practice
Half the group signs up for something in the spring and the other half spends twelve weeks listening to them talk about it. What we have arrived at, after three of these, is a build that changes remarkably little from week to week. The Tuesday loop stays exactly as it is. Thursday in the oak wood stays as it is. One run gets longer, one run gets a bit of honest work in it, and everything else is left alone on purpose, including the part of you that wants to do more.
Calm is not the same as easy, and it is certainly not the same as unambitious. It means the plan survives a bad week without being rewritten, that nothing in it depends on the weather being kind, and that missing a Thursday in week six is not a debt to be repaid on Saturday. People who train calmly arrive in April a little less fit than they might have been and considerably more likely to be there at all, which is the trade every one of us has now made twice.
The long run, and where to put it
The long run goes on Sunday morning and grows by about a kilometre a week, with a shorter week every fourth one because bodies are not linear. It starts at twelve or thirteen for anybody already running the group loops and tops out at eighteen, which is deliberately short of the distance. The last three kilometres of a half marathon are a matter of nerve and pacing rather than of having run them in training, and everybody here who has gone to twenty-one in February arrived at the start line tired.
Where you run it matters more than most plans admit. Out and back along the Nemunas is flat, uninterrupted and mentally hard: the same view twice and no reason to slow down. The lake out at Lampėdis suits the longer weeks, because a circuit you can leave after any lap gives a tired person permission to stop at sixteen instead of abandoning at eight. In the last month we do at least one long run that starts at the river and climbs into the oak wood at kilometre twelve, when the legs are already honest.
Said on the run
- About a kilometre a week; every fourth week is shorter
- Top out near eighteen, not at the race distance
- A circuit lets a tired person stop early instead of abandoning
- One long run a month with the climb after kilometre ten
One session a week, and no more
One session a week, on Thursday, and the word session is doing a great deal of work in that sentence. For most of the build it is nothing more than the last third of the run at a pace that makes conversation short rather than impossible. Six or seven kilometres easy, then three where you stop talking about your week. The point is to spend some time at an effort that feels like the middle of a race, without ever spending enough of it to need three days to recover.
From about week eight we swap that for something more specific: four or five repetitions of roughly a kilometre on the flat stretch of the embankment, with two or three minutes of jogging between them, run at the pace you think you can hold for the whole race rather than faster. Running them faster is the single most common mistake in this group and I have made it myself in two separate springs. The session exists to teach the pace, not to prove anything about it.
The last fortnight, and the morning itself
The final two weeks are where a calm build pays for itself, because there is nothing to undo. The long run comes down to about twelve, then to eight. Thursday shrinks to a couple of short efforts that exist to keep the legs awake. Sleep goes up if it can be made to. People feel sluggish and faintly anxious in a taper, every single time, and knowing that in advance is most of the cure. I tell newcomers to expect one genuinely awful run about ten days out and to ignore it entirely.
The advice from this group about the morning itself is unglamorous and consistent: eat what you ate before your long runs, wear the older of your two pairs unless the newer one has a hundred kilometres in it, start slower than the people around you, and be honest about the first five kilometres, which ought to feel far too easy if you have got it right. Afterwards we do what we always do, which is walk to a café and sit down for longer than the running took.
Said on the run
- Long run down to twelve, then eight; nothing new in either
- Expect one awful run around ten days out, then ignore it
- Race breakfast is the long-run breakfast, not an experiment
- The first five kilometres should feel far too easy