Beginner Half Marathon Training Plan: 12 Weeks to Your First Finish

If you can run 10K comfortably, most of the fitness a half marathon asks for is already there. Your breathing settles, your pace feels sustainable, and an hour on the road no longer sounds like a big deal. What isn’t there yet is the body’s tolerance for two or three hours of running: the feet, calves, knees and hips that absorb every step. Building that tolerance is what this beginner half marathon training plan spends its twelve weeks doing. Gradual running does part of the job. Two short strength sessions a week do the rest, which is why they sit in the plan alongside the runs.

The weeks won’t go in a straight line. Some long runs will feel easy and leave you wondering why you were nervous. Others will feel heavy from the first mile. And somewhere in the middle, a cold, a work trip or a sore calf will probably cost you a few runs. Twelve weeks is three months of normal life, after all, and normal life rarely hands anyone three clean months.

For that reason, the plan below comes with its reasoning attached. Every long run has a time cap, and you’ll see why. There’s a walk-break option for anyone who wants it. In addition, there’s a clear set of rules for what to do when a week goes wrong, so a missed week changes the plan instead of ending it. Follow it as written when life cooperates, and adjust it with confidence when it doesn’t.

How Long to Train for Your First Half Marathon

Twelve weeks is enough time to train for a first half marathon if you can already run for 30 minutes without stopping, about three times a week. If you can run 10K comfortably, twelve weeks still fits, and the early weeks will simply feel easy. If 30 continuous minutes is still out of reach, build to it first and then start week 1.

The 30-minute test is more useful than a distance test because it measures the same thing for everyone. Two runners who both cover 30 minutes are ready, even if one covers 3.5 miles and the other covers 2.5. If you’re still building to 30 minutes, the EndoGusto Couch to 5K plan gets you there.

At its busiest, in week 10, this first half marathon training plan asks for about three and a half hours of running across three days, plus two strength sessions of about 25 minutes. Most weeks are well below that. The days are flexible, as long as the midweek run and the long run have at least one day between them. Put the long run on the day you have the most time, which for most people means a weekend morning. If you’re returning from a running injury, check with a doctor or physical therapist before you start.

How This Beginner Half Marathon Training Plan Works

Each week has three runs, and each one has a different job. The long run builds the endurance the race needs. The midweek run adds a little faster running, so race effort feels familiar on the day. Meanwhile, the easy run adds time on your feet without adding much fatigue. An optional fourth session, either a short easy run or 30 minutes of cycling, swimming or brisk walking, is there for weeks when you have the time and the energy. Skipping it won’t hold your training back.

Two short strength sessions complete the week. Unlike the optional session, they’re part of the plan, and the strength section below covers what to do and where they fit.

Three Efforts, Measured by Talking

The plan uses three efforts, and you can judge all of them by how easily you can talk.

• Easy: you can hold a full conversation. Most of your running happens here, including every long run.
• Steady: you can speak in short sentences, but you’d rather not. This is roughly the effort you’ll hold on race day, and the midweek runs use it in short blocks.
• Strides: 20 seconds of quick, relaxed running near the end of an easy run, followed by a walk or slow jog until your breathing settles. Shoulders and face stay loose. They are not sprints.

Effort works better than pace in a first half marathon training plan for a practical reason. On a hot day, a hilly route or a tired week, the same effort produces a slower pace. Chasing a pace number in those conditions turns an easy run into a hard one. So, if you run with a watch, use it to record the run rather than steer it. The EndoGusto guide to easy run training covers why easy days tend to drift faster than they should.

Lighter Weeks

Weeks 4 and 8 are lighter on purpose. The long run drops back, and the midweek run loses its steady blocks. These weeks give the previous three weeks of work time to settle in, and most runners finish them feeling fresher than they started. If you feel strong in week 4, run it as written anyway, because week 5 is where that freshness gets spent.

The 12-Week Beginner Half Marathon Training Plan

All times in the beginner half marathon training plan below are in minutes. Start each run with a few minutes of brisk walking, which isn’t counted in the scheduled time. Steady blocks sit in the middle of the run, after at least 10 minutes of easy running, with 2 to 3 minutes of easy jogging between them.

Week	Run 1: Easy	Run 2: Midweek	Long Run	Strength	Optional
1	30 easy	30 easy + 4 strides	45 easy	2 × bodyweight	20–30 easy or cross-train
2	30 easy	35 easy + 4 strides	55 easy	2 × bodyweight	20–30 easy or cross-train
3	35 easy	35 with 3 × 5 steady	65 easy	2 × bodyweight	30 easy or cross-train
4 (lighter)	30 easy	30 easy + 4 strides	50 easy	2 × bodyweight	Rest
5	35 easy	40 with 3 × 6 steady	75 easy	2 × resisted	30 easy or cross-train
6	40 easy	40 with 2 × 10 steady	85 easy	2 × resisted	30 easy or cross-train
7	40 easy	45 with 3 × 8 steady	95 easy	2 × resisted	30–40 easy or cross-train
8 (lighter)	30 easy	35 easy + 6 strides	70 easy	2 × resisted, one fewer set	Rest
9	40 easy	45 with 2 × 12 steady	105 easy	2 × resisted	30–40 easy or cross-train
10	40 easy	50 with 20 steady	120 easy or 12 miles, whichever comes first	2 × resisted	30 easy or cross-train
11	35 easy	40 with 2 × 8 steady	75 easy	1–2 × resisted, 2 sets	20–30 easy or cross-train
12 (race week)	30 easy + 4 strides	20 easy, two days before the race	Race day: 13.1 miles	1 × bodyweight, early in week	Rest

Beginner half marathon training plan: 12-week schedule with strength sessions (run times in minutes).

The long run grows by about 10 minutes a week, and each new high in total weekly running sits no more than about 15 percent above the previous one. That pace of growth is deliberate. In a study of novice runners, Nielsen and colleagues (2014) tracked how quickly weekly running distance grew. Runners who increased it by more than 30 percent over two weeks were more vulnerable to injuries such as knee pain and shin pain than those who kept increases under 10 percent. You can read the study on weekly distance progression in novice runners in full.

Two-week windows are where runners tend to cross that line without noticing, because no single week feels like a big jump. For instance, take a runner on 120 minutes a week. Bringing back a 30-minute optional session and adding 20 minutes to the long run over the same fortnight puts them up about 40 percent, yet neither change feels dramatic. The optional session counts toward your weekly total, so if you’ve been skipping it, bring it back during a lighter week rather than a build week.

Why the Long Runs Are Capped by Time

Two runners following the same plan can live very different long runs. A runner at 10 minutes per mile finishes 10 miles in 100 minutes. A runner at 13 minutes per mile needs 130 minutes for the same distance, which is half an hour longer on their feet at the same point in the plan. Setting long runs by time keeps the workload closer between them. In week 9, both runners get 105 minutes and cover whatever distance that turns out to be.

The peak comes in week 10: 120 minutes or 12 miles, whichever comes first. For the 10-minute-mile runner, that’s 12 miles. For the 13-minute-mile runner, it’s a little over 9. Stopping there can feel like stopping short, especially for the slower runner, whose race may last close to three hours.

However, the long run’s job is to prepare you to run the race, not to rehearse all of it. Past about two hours, a beginner’s long run takes longer to recover from, and the following week’s runs tend to suffer for it. On race day, fresher legs after the lighter final weeks, plus steady fueling, usually carry first-time runners through the last few miles. A two-hour cap gives every runner the same limit on time on their feet, whatever their pace.

Long Runs Stay Easy

Every long run in this plan is run at easy effort, including the last one. The usual way a long run goes wrong is a quick start on fresh legs, followed by a grind through the final third. If the last 15 minutes of a long run feel noticeably harder than the first 15, start the next one slower.

💡 Coaching tip: Pay attention to the easy run two days after each long run. If your legs feel normal by then, the long run was the right size. If they still feel heavy, repeat the same long-run duration the following week instead of adding 10 minutes.

Strength Training for Your First Half Marathon

Strength training matters for a first half marathon because the long runs ask your muscles and tendons to absorb impact for two hours or more. Two short sessions a week, about 20 to 25 minutes each, are enough for a beginner. Start with bodyweight exercises for the first four weeks, add resistance from week 5, and keep a lighter version going through the final two weeks.

What Strength Work Does for a Runner

Each running step lands with roughly two and a half times your body weight, and a half marathon takes more than 20,000 steps for most first-time runners. The calves take a large share of that. In fact, modeling work by Dorn, Schache and Pandy (2012) found that the two main calf muscles, the soleus and gastrocnemius, do more than any other muscles to hold the body up with each running step. The hips and thighs do similar work, keeping the pelvis level and the knee tracking straight every time you land on one leg.

Late in a long run, those muscles tire. The calves tighten, the stride shortens, and a knee or shin that was quiet at mile 4 starts to ache at mile 9. A stronger muscle works at a smaller share of its maximum on every step, so it has more left when the miles add up. Running builds some of that strength. However, slow, loaded exercises build it faster, because they take the same muscles closer to their limit than an easy run does.

💡 Research: A meta-analysis of 25 trials by Lauersen, Bertelsen and Andersen (2014) found that strength training reduced sports injuries to less than a third, and roughly halved overuse injuries. The trials covered a range of sports rather than running alone, and the authors read the subgroup results with some caution. Even so, overuse injuries, the kind that build slowly in the knees, shins and Achilles tendons, are the ones a twelve-week build tends to produce.

There’s a performance benefit too. A systematic review of strength training in distance runners by Blagrove, Howatson and Hayes (2018) found that two to three strength sessions a week improved running economy by 2 to 8 percent, in runners at every level of training. In practice, the same pace costs slightly less effort, which matters most in the last few miles of the race.

How to Fit Strength Into the Week

Two slots work well: straight after the easy run, or on a day with no running. The one day to avoid is the day before the long run, so you leave your legs fresh. For example, a week might run like this: strength on Monday, the midweek run on Tuesday, the easy run plus a second strength session on Thursday, and the long run on Saturday, with rest days in between.

Expect some muscle soreness after the first two or three sessions, lasting a day or two. It fades quickly once the movements are familiar, which is one reason the plan starts with bodyweight only. On a week when time is short, a 10-minute version still counts: calf raises, split squats and a side plank.

Start With Bodyweight (Weeks 1 to 4)

Move slowly, taking two to three seconds on the way down, and finish each set with two or three reps you could still do.

• Squats: 2 × 12. Lower until your thighs are about level with a chair seat, then stand tall.
• Reverse lunges: 2 × 8 each leg, stepping back and pushing up through the front heel.
• Glute bridges: 2 × 12. Once these feel easy, switch to single-leg bridges.
• Calf raises: 2 × 15 with straight knees, then 2 × 15 with knees bent, on the edge of a step. The bent-knee version targets the soleus.
• Side plank: 2 × 20 to 30 seconds each side.

Add Resistance (Weeks 5 to 10)

By week 5, most bodyweight sets will feel easy, which is the signal to add load. Dumbbells, a kettlebell, a backpack filled with books or a resistance band all work.

• Goblet squat: 3 × 8 to 10, holding one weight at your chest.
• Split squat or step-up: 3 × 8 each leg, holding weights at your sides. Use a step about knee height.
• Romanian deadlift: 3 × 8 to 10. Hinge at the hips with a long back until you feel the back of your thighs, then stand up.
• Single-leg calf raise: 3 × 10 to 12 each leg holding a weight, plus one bent-knee set.
• Banded side steps: 2 × 12 steps each direction, with a band around the knees or ankles.

Choose a weight that makes the last two reps of each set hard while your form holds. When all three sets feel comfortable, add a little weight. In the lighter weeks, drop one set and keep the same weight. For a wider look at programming strength around endurance training, see the EndoGusto guide to strength training for endurance athletes.

Weeks 11 and 12

In week 11, keep the same weights but drop to two sets, and do one or two sessions. In race week, do one short bodyweight session early in the week and nothing in the final four days. Strength gained over ten weeks won’t fade in two, so this is about arriving with fresh legs.

The Walk-Break Option

In a run-walk session, you alternate a set period of running with a short walk from the very start of the run, before you feel tired. A common starting ratio is 4 minutes of running to 1 minute of walking. Runners who already handle 40 minutes of continuous running comfortably often prefer 9 minutes of running to 1 of walking. Either way, the walk is part of the method, not a sign that something has gone wrong.

💡 Research: In a study of 42 recreational marathon runners, a run-walk group and a continuous group finished in similar times. The run-walk group also reported less muscle pain and fatigue afterward (Hottenrott and colleagues, 2016). The study looked at the marathon, but the same logic applies to any first-timer whose half marathon will last well over two hours. Short, regular walks spread the work across the whole race.

Two rules make walk breaks work. First, the walk is scheduled. Take it when the timer says so, especially in the first half of the run when you feel you don’t need it. Second, if you plan to walk on race day, use the same ratio on every long run from week 5 onward, so the rhythm is familiar by race week. The times in the plan stay the same, since the walks count as part of the session. Walk briskly, which keeps you moving forward and makes the restart easier.

There’s also a middle option for runners who prefer to run continuously. They can walk through each aid station on race day, take a drink, and restart after 20 or 30 seconds. To practice it, plan a route that passes a water fountain, or leave a bottle on a wall along a loop.

What to Do When You Miss a Week

If you miss a full week of this plan, don’t try to make it up. Instead, repeat the last week you completed, then carry on in order. To get back on schedule, drop the next lighter week (week 4 or week 8), because the missed week has already given your body the rest a lighter week provides. Missed runs within a week are simply skipped, and a missed week late in the plan means a slightly shorter longest run, not a catch-up.

Missing a Run or Two

A few missed days won’t undo weeks of steady training, so skip the run and continue with the next one on the schedule. When a busy week leaves room for fewer runs than planned, protect them in this order: the long run, the midweek run, one strength session, then the easy run. The optional session is the first to go.

💡 Common mistake spotlight: Stacking missed runs. Squeezing a missed Tuesday run into Saturday, the day before the long run, turns one missed session into two tired ones. Once a run has been skipped, the next scheduled run is the one that counts.

Missing a Full Week

The repeat-and-drop rule covers weeks 1 to 8. Weeks 9 and 10 have no lighter week left to absorb the gap, so the plan shortens instead. If you miss week 9, run week 10 with a 105-minute long run instead of 120. If you miss week 10, run week 11 as written, but extend its long run to 90 minutes. Missing week 11 or race week changes nothing, because your fitness is already set.

Missing Two Weeks or More

Two missed weeks is where the race date starts to shape the plan. Restart with a long run about 20 to 30 minutes shorter than your last completed one, then add 10 minutes a week and skip the remaining lighter weeks. Keep weeks 11 and 12 as written. On the strength side, do one week of bodyweight sessions before returning to the weights you were using. Your longest run may top out at 90 to 105 minutes instead of 120, which is enough to finish, especially with walk breaks. In that case, make finishing the goal rather than a finish time. If you lose three weeks or more after week 6, a later race may be the better fit.

Coming Back From Illness

Illness isn’t rest, so if the missed week was a sick week, keep the lighter weeks in place rather than dropping one. Return once any fever is gone and your everyday energy feels normal again. For the first week back, run two or three easy runs of 20 to 30 minutes, with no steady blocks, and keep strength sessions to bodyweight. Then rejoin the plan using the rules above. If you had chest symptoms or a high fever, check with a doctor before running again.

When the Plan Stalls

Sometimes nothing is missed, yet the training stops feeling like progress. Easy runs feel harder at the same effort for more than a week, sleep gets worse, or the two-day leg check after the long run keeps coming back heavy. When that happens, take a lighter week now and then repeat the week you were on. Arriving at the start with a 105-minute longest run and fresh legs is a better position than arriving with a 120-minute run and lingering soreness. Similarly, sharp or localized pain that worsens as you run is a reason to stop and get it checked. The same goes for any pain that changes how you run.

Race Week and Race Day

Race Week

Race week is short on purpose. Fitness won’t improve in the final few days, so the two runs and one light strength session simply keep your legs moving while they freshen up. Above all, nothing on race day should be new. The shoes, socks, shorts, breakfast and gels you use on the day should all have been through at least one long run. Eat a familiar breakfast two to three hours before the start, the same one that worked before your longer runs.

Fueling

For many first-time runners, the race lasts somewhere between two and three hours. For efforts of one to two and a half hours, sports nutrition guidelines recommend 30 to 60 grams of carbohydrate per hour. That figure comes from a joint position statement by the American College of Sports Medicine and two dietetics organizations (Thomas, Erdman and Burke, 2016).

In practice, a standard energy gel holds about 20 to 25 grams, so one gel every 30 to 40 minutes after the first half hour lands inside that range. Check the label, since some gels hold 30 to 40 grams and need spacing further apart.

Taking gels while running takes practice, and long runs are the place to find out which ones sit well. Start on the 75-minute long run in week 5 and use the same product and timing on every long run after that. Drink water at aid stations according to thirst, and take a few sips with each gel.

Pacing

Run the first 3 miles (about 5 km) at easy effort, not steady. Crowds and nerves make steady feel easy early on, and that early speed comes back as a slower finish. For example, take a runner whose steady effort sits around 11:30 per mile in training. On race morning, they can drift to 10:45 for the first two miles without noticing, then feel it from mile 9. A simple check helps: at mile 2, say a full sentence out loud. If you can’t, slow down.

From mile 3, settle into steady effort. After mile 10, use whatever you have left. If you’re using walk breaks, start them from the first interval, exactly as you practiced. For more on how pacing changes across distances, see the EndoGusto guide to running race strategy.

Adapting This Plan for Athletes You Coach

Coaches can use this half marathon training plan for beginners as a starting template, and its structure is built to bend around the individual. Beginners rarely have a reliable test result, so the first two weeks of easy runs make a useful baseline. They show each athlete’s easy pace and, where available, heart rate at a known effort. Once an athlete has a recent 5K or 10K result, steady effort can be tied to it. The EndoGusto article on predicting race times covers how to turn one result into training paces.

The time cap matters most for the slowest athletes in a group, who are also the most likely to ask to see 13 miles in training. Holding them at 120 minutes protects the final two weeks, when they need to be absorbing training rather than recovering from it. For athletes who can train four days a week, the optional session becomes a regular easy run, introduced in a lighter week as described above. Strength sessions work best on named days in the athlete’s plan, like any run. Coaches can then adjust the exercises for athletes with gym access or a history of a particular injury.

The missed-week rules also give coach and athlete a shared plan before anything goes wrong. After a sick week, the conversation is about which rule applies, not whether the race is still on. EndoGusto keeps each athlete’s completed and remaining weeks in one plan, so when a week goes missing, the coach adjusts what’s ahead and the athlete sees the updated schedule.

On race morning, that athlete has run for close to two hours, spent twelve weeks making their legs stronger, practiced their fueling and handled at least one week that didn’t go to plan. The final miles will still be new. They’ll reach them with everything else already tested.

Suggested References

• Blagrove, R. C., Howatson, G., & Hayes, P. R. (2018). Effects of strength training on the physiological determinants of middle- and long-distance running performance: A systematic review. Sports Medicine, 48(5), 1117–1149.
• Dorn, T. W., Schache, A. G., & Pandy, M. G. (2012). Muscular strategy shift in human running: Dependence of running speed on hip and ankle muscle performance. Journal of Experimental Biology, 215(11), 1944–1956.
• Hottenrott, K., Ludyga, S., Schulze, S., Gronwald, T., & Jäger, F.-S. (2016). Does a run/walk strategy decrease cardiac stress during a marathon in non-elite runners? Journal of Science and Medicine in Sport, 19(1), 64–68.
• Lauersen, J. B., Bertelsen, D. M., & Andersen, L. B. (2014). The effectiveness of exercise interventions to prevent sports injuries: A systematic review and meta-analysis of randomised controlled trials. British Journal of Sports Medicine, 48(11), 871–877.
• Nielsen, R. O., Parner, E. T., Nohr, E. A., Sørensen, H., Lind, M., & Rasmussen, S. (2014). Excessive progression in weekly running distance and risk of running-related injuries: An association which varies according to type of injury. Journal of Orthopaedic & Sports Physical Therapy, 44(10), 739–747.
• Thomas, D. T., Erdman, K. A., & Burke, L. M. (2016). Position of the Academy of Nutrition and Dietetics, Dietitians of Canada, and the American College of Sports Medicine: Nutrition and athletic performance. Medicine & Science in Sports & Exercise, 48(3), 543–568.