Ein Halbmarathon-Trainingsplan, der Long Runs, Schwellenarbeit und Erholung ausbalanciert — für deinen ersten 21,1k oder eine Bestzeit unter 2 Stunden.
The half marathon is the distance where aerobic fitness and pacing discipline meet on equal footing. At 21.1 kilometres, or 13.1 miles, the race is long enough that glycogen management, fuelling, and long-run conditioning start to matter, but short enough that you still run it at a genuinely hard intensity, typically around eighty-eight to ninety-two percent of your heart rate at threshold. It is one of the most rewarding distances to train for, because the investment required, ten to fourteen weeks of structured work, returns a race experience that feels both controllable and ambitious. You are not surviving the way you might in a first marathon. You are racing. But you are racing for ninety minutes or two hours, which means every training decision in the preceding three months has to serve the dual goal of expanding your aerobic base and sharpening your half-marathon-pace economy. This guide walks through how to build a half marathon plan, what it should contain, how to pace the race, and the mistakes that derail most attempts.
A half marathon training plan is a ten to fourteen week structured progression that moves you from baseline running fitness to the ability to race 21.1 kilometres at a committed pace. The plan organises around four pillars: aerobic volume, long-run development, threshold work, and half-marathon-pace specificity. Aerobic volume is the largest ingredient by far, because the half is a predominantly aerobic event, with roughly ninety-five percent of the energy coming from oxidative metabolism. Long runs progress from whatever you can currently manage up to twenty-four to twenty-eight kilometres, which is longer than race distance for many intermediate runners, because it builds fatigue resistance and metabolic efficiency. Threshold runs raise the pace you can hold before lactate accumulation. And half-marathon-pace segments, typically embedded in longer runs or workouts, rehearse the exact demands of race day. Everything else, easy runs, strides, strength work, recovery, supports those four.
Structurally, the plan divides into three phases. The base phase, weeks one through four or five, focuses on accumulating aerobic volume and light threshold exposure. The build phase, weeks five or six through nine or ten, pushes both volume and intensity, with weekly totals often hitting their peak and quality sessions becoming more demanding. The specific phase, the final three or four weeks before taper, centres on half-marathon-pace work and long runs that include substantial chunks at race pace. The taper is typically two weeks, with volume dropping thirty to forty percent in week one and fifty percent or more in race week, while one or two short sharp sessions keep the legs fast. A serious half plan is not just about accumulating kilometres; it is about sequencing them. The order in which you introduce aerobic work, threshold, and race pace determines whether you arrive at the start line fit, flat, or fried.
The half marathon punishes unstructured training in ways the 10k does not. You can run a respectable 10k off easy-only running plus enthusiasm on race day. You cannot do the same with a half. The distance is long enough that any cracks in your aerobic base, fuelling, or pacing will show up between kilometre fourteen and eighteen, which is exactly where the race is decided. Runners who train only with easy miles hit kilometre sixteen feeling strong and then discover that their threshold is too low to hold the pace they opened at, so they lose thirty to ninety seconds per kilometre over the last five. Runners who train only with hard sessions get sharp early, burn out by week seven, and either skip the race or drag themselves through it on fumes. A structured plan forces the correct ratio: roughly eighty percent of your weekly volume at easy aerobic intensity and twenty percent at threshold or faster. That ratio is not a style choice; it is how the human aerobic system actually adapts.
The second reason structure matters is pacing. Holding half-marathon pace for twenty-one kilometres is not a matter of grit; it is a matter of familiarity. You need to have run chunks of the race pace many times before race day, so your body knows the cadence, the breathing, the effort, and the sensation at the twelfth kilometre. Without rehearsal, you guess on race day, and guessing at half-marathon pace goes wrong in predictable directions. You start too fast because the first three kilometres always feel easy. You hit kilometre eight slightly redlined and pretend you are fine. You crack at kilometre sixteen. A plan with regular race-pace segments, progression long runs, and threshold work closes the gap between the pace you want to run and the pace you actually know how to run. It converts hope into evidence.
The physiology of the half marathon is heavily aerobic. Roughly ninety-five percent of the energy you burn comes from oxidative metabolism, which means the biggest determinant of your time is aerobic capacity combined with your sustainable percentage of VO2 max. Elite half marathoners hold roughly eighty-eight percent of VO2 max for the duration; recreational runners typically hold seventy-five to eighty-two percent. Raising that ceiling is the job of threshold training. Tempo runs of thirty to forty-five minutes at the pace you could hold for about an hour in a race, and cruise intervals of three to five times two kilometres at that pace with short recovery, teach your body to clear lactate efficiently. Do that consistently for eight to twelve weeks and your threshold pace measurably moves. The mechanism is not magic; it is mitochondrial density, capillary expansion, and enzyme upregulation, all of which respond to repeated exposure at the right intensity.
The second adaptation is fatigue resistance. The half marathon tests your ability to keep running efficiently when glycogen is draining and central fatigue is building. The long run is the primary lever. Progressing the long run from wherever you start up to twenty-four to twenty-eight kilometres, mostly at easy aerobic pace with occasional race-pace finishes, teaches your body to oxidise fat more effectively, preserve glycogen, and keep motor patterns crisp when tired. Half-marathon-pace long runs, where you include eight to fifteen kilometres at goal pace inside a longer overall run, are the most specific workout in the build. They combine fatigue resistance and race-pace rehearsal in one session, which is why they anchor the last four weeks of most serious plans. Add in one threshold session per week, adequate easy volume, and strides to preserve turnover, and you have the full adaptive stimulus for half-marathon performance.
A typical half marathon training week contains five to six running days and one or two rest or cross-training days. The two quality sessions are a threshold or tempo run and a half-marathon-pace or long-run quality session, spaced by at least seventy-two hours. The long run sits on Sunday for most runners, the tempo or threshold mid-week, typically Tuesday or Wednesday, and the race-pace session on Friday or Saturday when the week includes three quality days. Easy runs on the remaining days are deliberately slow, ninety seconds to two minutes per kilometre slower than half-marathon pace, because their job is to add aerobic volume without interfering with the next hard session. Strides, six to eight repetitions of twenty seconds at near-sprint pace with full recovery, go into one easy day. Total weekly volume for intermediate runners ranges from 45 to 80 kilometres, with advanced runners pushing past ninety.
The structure evolves across the cycle. In base, the two quality sessions are moderate: a thirty-minute tempo and a progression long run ending with three to four kilometres at moderate effort. In build, the threshold session extends to forty to forty-five minutes of total tempo work, and the long run grows with longer race-pace finishes. In specific, the race-pace session becomes something like three by four kilometres at goal pace with two to three minute recovery, and the long run includes ten to fifteen kilometres at goal pace. Volume peaks about three weeks before race day, not race week. The taper is two weeks: the first reduces volume by thirty to forty percent while preserving intensity, and race week cuts another fifteen to twenty percent and drops the long run to ten to fourteen kilometres. Done well, the structure looks boring on paper and produces a sharp, prepared runner on race day.
A sub-2 hour target requires a goal pace of 5:41 per kilometre, or roughly 9:09 per mile. That pace is challenging but accessible to most runners with a solid base and twelve weeks of structured training. Weekly volume typically sits between 40 and 55 kilometres. A representative week in the build phase might look like this. Monday: rest or 30 minute easy. Tuesday: 10 kilometres including 5 kilometres at threshold, around 5:20 per km. Wednesday: 8 kilometres easy with six strides. Thursday: rest or 6 kilometres recovery. Friday: 12 kilometres with 3 by 3 kilometres at goal half pace, 5:40 per km, 2 minute jog recovery. Saturday: 6 kilometres easy. Sunday: long run, 18 to 22 kilometres, last 5 kilometres at goal pace. Total: roughly 55 kilometres. The plan progresses the long run by one to two kilometres per week, and the race-pace volume within workouts grows from 6 to 12 kilometres over the specific block.
A first half marathon has different priorities. The goal is to finish strong, learn the distance, and avoid injury, not to chase a specific time. Weekly volume typically sits between 30 and 45 kilometres. A representative week might look like this. Monday: rest. Tuesday: 6 kilometres easy. Wednesday: 7 kilometres with 3 kilometres at steady effort, comfortably moderate but not threshold. Thursday: 30 to 40 minute easy run or cross training. Friday: rest or mobility. Saturday: 5 kilometres easy with four strides. Sunday: long run, progressing from 10 kilometres in week one to 22 kilometres three weeks before the race. Total: roughly 35 kilometres. The long run is the centrepiece; the rest supports it. Quality sessions are optional and kept to steady-state efforts rather than intervals. The taper is gentler and longer, often starting two and a half weeks out, because first-time half marathoners accumulate more psychological fatigue than they realise, and extra freshness is worth more than extra fitness.
Start a half marathon plan when you have a base of at least six weeks of consistent running at three to four days per week, with a current longest run of at least ten kilometres. If you are coming off a 10k cycle or just finished another training block, you already have the base and can move directly into the half plan. If you are returning from a layoff or building from scratch, spend six to eight weeks rebuilding aerobic volume with easy runs before you begin. Starting a half plan without a base is the single most common source of injury in amateur running. The jump from sporadic running to five or six days a week of structured training is too large to absorb in a week or two, and the long run in particular will overload tendons and connective tissue faster than the cardiovascular system adapts.
Choose a race that sits ten to fourteen weeks out and work backwards. Twelve weeks is the most common length for intermediate runners. Fourteen weeks suits first-timers or anyone chasing a significant time drop. Ten weeks works when you are in shape and just need to sharpen. Put the race on the calendar, count back, and map each week to a phase: base, build, or specific. Flag the taper. Look at your calendar for known disruptions: work travel, weddings, holidays. Build those in. A half plan absorbs one disrupted week fairly well; two disrupted weeks costs you a minute or two; three or more disrupted weeks means you should either extend the plan or accept a lower target. Honest calendar math at the start of the cycle prevents late-stage panic and the desperate attempt to cram missed workouts into the final fortnight.
Half marathon training plateaus usually come from one of three causes: insufficient aerobic volume, too much moderate-intensity running, or too little race-pace specificity. If your threshold sessions are strong but your long runs fall apart, the fix is more easy volume on non-quality days. If your easy pace is slow and your race-pace sessions feel frantic, the fix is more threshold work and less time in the grey zone between easy and hard. If your long runs and tempos are solid but the race itself always goes badly, the fix is more race-pace segments in training, particularly inside long runs, and more practice fuelling and pacing under fatigue. Most plateaus are diagnostic rather than mysterious. Track your weeks, look at the distribution of intensity, and usually the problem is visible on paper within five minutes of honest review.
If you have been training for several cycles and stopped improving, consider a structural change rather than a harder plan. Add a fourth quality dimension, such as hill repeats once every two weeks, to improve running economy without adding volume. Or alternate cycles between mileage-focused blocks and intensity-focused blocks rather than trying to push both every time. Beginners improve quickly because almost any stimulus works; intermediate runners improve more slowly because they already absorb the common stimuli. Periodic deload weeks, every fourth week at seventy to seventy-five percent of normal volume, also help, because the cumulative fatigue of twelve to fourteen weeks without a break eventually caps adaptation. When in doubt, ease up for a week and come back sharper, rather than doubling down and going stale.
The taper for a half marathon is two weeks. Peak volume lands three weeks out. In week minus two, drop overall volume by thirty to forty percent while keeping one threshold session and one race-pace session, both shortened. The long run drops to around fifteen to seventeen kilometres, mostly easy. In race week, cut another fifteen to twenty percent from volume, and do one short, sharp session four to five days out, typically something like three kilometres of race pace broken into 1 kilometre repeats. Two to three days before the race, a short easy jog plus strides keeps the legs fresh. The day before is rest or a fifteen minute shakeout. Sleep on Thursday and Friday nights matters more than the night immediately before the race, because pre-race nerves often disrupt Saturday sleep without consequence.
Race day fuelling is modest but not optional. Eat a familiar breakfast two and a half to three hours before the start: oats with banana, toast with honey and a little nut butter, or whatever you have practised in your last three long runs. Sip water until forty-five minutes before the gun, then stop. Most runners take one gel around kilometre seven to nine, and a second around kilometre fourteen to sixteen if the pace is hard. Practise both timings in training. Pacing strategy is even splits or a marginal negative split. Run the first three kilometres at goal pace, not faster, even though everything in your body will tell you to go. Lock in the cadence. By kilometre ten, you are halfway through the work; by kilometre fifteen, the race begins. The last six kilometres are where months of threshold and race-pace training pay dividends. Finish strong, finish committed, and finish knowing the result was built over three months, not found in the final kilometre.
Build your personalised half marathon plan on Endurly. Set your current fitness, goal time, and race date, and get a ten to fourteen week schedule with race-pace long runs, fuelling prompts, and a taper that actually works.
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