Training guide
How to Train for a Half Marathon: A Complete Guide
A useful half marathon plan builds from your current running routine, grows one weekly long run, and adds a small purposeful session only when easy running and recovery are stable. The right number of weeks and miles is the amount you can complete consistently—not the most ambitious schedule on paper.
The short answer
A useful half marathon plan builds from your current running routine, grows one weekly long run, and adds a small purposeful session only when easy running and recovery are stable. The right number of weeks and miles is the amount you can complete consistently—not the most ambitious schedule on paper.
Start with the week you can repeat
Half marathon training turns the running you can handle now into a dependable 13.1-mile race effort. Start with one question: “What can I do this week and still feel ready to train next week?” A plan that begins above your current routine creates catch-up decisions. A plan that begins close to it gives you room to build confidence and endurance.
This guide is for runners who already have at least a small, repeatable running routine and want to turn it into a half-marathon plan. If you are not yet running regularly, start with the beginner guide. If you are already running three or more days a week, this guide will help you choose a calendar, shape the week, and decide what to progress first.
The sequence is simple: make running days regular, build one weekly long run, then add one small purposeful session only when recovery supports it. Your recent routine—not a goal time or someone else’s schedule—determines where you begin. Look at the last three or four ordinary weeks: how often you ran, your longest comfortable outing, and the days you can genuinely protect. Those facts should make the opening week feel familiar, not frightening.
Choose the planning path that fits you now
| Your current running | Best next move | Do not do yet |
|---|---|---|
| Not running regularly, or restarting from almost no running | Build a walking or run-walk habit first with the beginner guide, then begin a race-specific block. | Start a plan whose first long run already feels like an event. |
| One or two manageable runs most weeks | Make those runs consistent, then add a small amount of time to one of them before adding a faster workout. | Increase days, distance, and pace in the same week. |
| Three or four controlled runs most weeks | Choose a 12–16 week plan whose first week resembles your current routine. | Pick a plan because its peak week looks impressive. |
| Four or more stable runs with a familiar long run | Use a focused plan and add specific work gradually around your established easy running. | Assume a shorter calendar removes the need for recovery or long-run progression. |
Set up a plan you can begin this week
- 1
Record the routine you can already absorb
Write down the last three weeks of running or run-walking and the longest outing that did not disrupt the following days. This is your starting point—not a finish-line prediction.
- 2
Protect the days that are real
Choose days with enough room for changing, the run, food, and recovery. Three dependable running windows are better than five that disappear whenever life gets busy.
- 3
Match the timeline to the opening week
An 8-week block can suit a runner with a strong, stable base. Many runners need 12–16 weeks, while newer runners may need a base phase first. Use the half-marathon timeline guide if race date is the main uncertainty.
- 4
Choose one outcome to rehearse
For a finish goal, practice a controlled run-walk pattern or patient easy effort. For a time goal, practice beginning conservatively and taking familiar fuel. The clock can follow; start with the behavior you can repeat.
Build the week around four simple jobs
You do not need every kind of run at once. Start by knowing what each part of the week is for.
Easy runs build the habit
An easy run is running at an effort where you can speak in full sentences. Its pace will change with hills, weather, sleep, and fatigue. The point is to accumulate time on your feet without turning every session into a test. If talking becomes difficult, slow down or use planned walk breaks.
Most of a half-marathon plan is made of easy running. That can seem unremarkable, but it is where you learn what a normal training week feels like. Easy running also protects the contrast that makes a harder session useful later.
The long run builds confidence with time
The long run is simply the longest planned run of the week. For a newer runner, its main job is to make sustained movement feel familiar. For a more experienced runner, it can eventually rehearse fuel, terrain, and race rhythm. It should not be a weekly race or a requirement to prove that you can already cover 13.1 miles.
Increase the long run only when the current one fits the rest of the week. If it regularly leaves you unable to run comfortably for several days, repeat or shorten it. The long-run workout guide can help once basic endurance is stable.
One purposeful run is optional at first
A purposeful run is one small, planned challenge—not a weekly race. It might be four to six relaxed strides after an easy run, four short hill repeats, or 15–20 minutes at a steady effort. Choose one option. The session works when you can complete it with controlled form and still keep the next run easy.
Add it only after your running days and long run feel settled. If you run three days a week, use one purposeful session at most; if the long run is still hard to recover from, use none. The workouts and paces guide explains each option in more detail without asking you to turn the week into a collection of hard days.
Recovery lets the training count
Rest days, easy days, sleep, and ordinary meals are not empty spaces in the plan. They are when the work becomes something you can repeat. Some tiredness is normal after a new session; pain that changes your stride, worsening discomfort, or fatigue that keeps accumulating deserves a more cautious response.
Think of recovery as information. When easy runs feel broadly normal, the long run does not flatten the following week, and you can complete the next planned session with control, the workload is probably appropriate. When those signals worsen together, hold or reduce the plan before adding more.
Choose a weekly shape you can start next week
| Best for | A simple week | One non-negotiable rule |
|---|---|---|
| You can protect three runs and are building consistency | Tue easy · Thu easy with 4–6 relaxed strides once ready · Sun long run | Until the long run feels routine, Thursday stays easy; strides are optional, not a required workout. |
| You already handle four runs comfortably | Mon easy · Wed purposeful run · Fri easy · Sun long run | Friday must stay easy. It protects the long run rather than becoming a second workout. |
| You already run five days with normal recovery | Mon easy · Tue purposeful run · Thu easy · Fri easy or strides · Sun long run | Only one demanding session plus the long run. The added days spread easy volume; they do not add intensity. |
Progress the long run with guardrails
| What happened after the long run | Next long-run decision | Example |
|---|---|---|
| You finished in control and your next one or two days felt broadly normal | Repeat it once, then add a small amount of time. | After two comfortable 60-minute long runs, try 65–70 minutes rather than adding distance and pace together. |
| The run was manageable, but life stress or other training is rising | Hold the same duration. | Keep the 60-minute run and remove the steady finish rather than forcing a bigger weekend. |
| You needed several days to feel normal, or the next easy run felt unusually hard | Shorten or repeat it before progressing. | Return from 75 minutes to 60–65 minutes, then reassess after a calmer week. |
Runner scenario
Scenario: Maya chooses the plan that fits her life
Maya, training for her second half marathon
Maya has run three days each week for two months, usually 14–18 miles total. Her recent long run is 7 miles. She has 14 weeks until race day and regularly works late on Wednesdays.
- The decision
- She finds a five-day plan that begins at 22 miles with Thursday intervals and a Saturday long run. The weekly total looks possible, but it changes both her running frequency and her reliable long-run day at once.
- Recommended approach
- Maya should begin with the three running days she already owns: easy Tuesday, easy Thursday, and long run Sunday. Because Wednesday work often disrupts sleep, she should not schedule a hard Thursday workout. After two stable weeks, she can add a short easy Saturday run or put a small purposeful session on Tuesday when the rest of the week supports it. She should hold the long run near 7–8 miles before progressing it.
- Why
- The plan protects Maya’s reliable Sunday window and removes a predictable recovery conflict. It changes one thing at a time, so she can tell whether a fourth easy run or a small purposeful session fits before asking the week to do both.
Use these rules when the plan meets real life
A schedule is a map, not a debt ledger. Protect the purpose of training rather than every missed box.
Missed an easy run
Let it go and continue with the next appropriate session. Do not stack it against a long run or harder workout.
Missed a purposeful run
Move it only when there is still at least one easy or non-running day before the long run. If it would land the day before the long run, skip it or make that day easy.
A hard week outside running
Repeat the current mileage, keep the long run shorter or unchanged, and remove faster work. Holding steady is a positive training decision, not a lost week.
Pain changes how you run
Stop the session and seek appropriate qualified guidance rather than trying to solve a health problem by adjusting pace.
Explore this topic
Build your understanding one decision at a time
How Long to Train for a Half Marathon
Choose an 8-, 12-, or 16-week half marathon training timeline based on your current running base, race goal, and available time.
Read guideHalf Marathon Training Phases Explained
See how base, build, peak, taper, and race weeks work together in a half marathon training plan.
Read guideHalf Marathon Weekly Mileage: How Much Should You Run?
Learn how to think about weekly mileage for a half marathon without forcing a one-size-fits-all number.
Read guideHow Many Days a Week Should You Run for a Half Marathon?
Choose a realistic number of running days for half marathon training, from a focused three-day structure to a higher-frequency routine.
Read guideStrength Training and Rest for Half Marathon Runners
Fit strength training and recovery days into a half marathon schedule without competing with your key running sessions.
Read guideHow to Adjust a Half Marathon Training Plan
A practical way to adjust half marathon workouts after a missed run, busy week, illness, travel, or an unexpectedly hard session.
Read guidePut it into a plan
Turn this guidance into your next useful step.
Use a free resource to explore your options, or build a race-specific plan around your date, availability, and current fitness.
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Related resources
How Long to Train for a Half Marathon
Choose an 8-, 12-, or 16-week half marathon training timeline based on your current running base, race goal, and available time.
Read guideHalf Marathon Weekly Mileage: How Much Should You Run?
Learn how to think about weekly mileage for a half marathon without forcing a one-size-fits-all number.
Read guideHow Many Days a Week Should You Run for a Half Marathon?
Choose a realistic number of running days for half marathon training, from a focused three-day structure to a higher-frequency routine.
Read guideQuestions runners ask
- How long should I train for a half marathon?
- Many runners use 12–16 weeks once they already have a modest running routine. A shorter block can work for a runner with a steady base, while a true beginner may need a separate habit-building phase before the race-specific plan begins.
- What if I have only 10 weeks until race day?
- First compare the opening week with your current routine. Ten weeks can be a useful focused block for a runner who already runs consistently and has a familiar long run. If the opening week would be a major jump, choose a later race, adjust the goal, or build a base before asking for race-specific work.
- Do I need to run 13.1 miles before race day?
- No. The long run should be long enough to develop endurance and rehearsed routines without overwhelming the rest of training. Some runners peak below race distance, especially when a longer run would create too much recovery cost.
- Should every week include a hard workout?
- No. Newer runners can improve for weeks with easy running and a gradually longer run. Add a harder session only when the basic week is stable and it will not compromise recovery or the long run.
- Can I use cross-training instead of adding another run?
- Yes, especially when it helps you protect the running routine you can recover from. Cross-training can support aerobic fitness, but it does not fully replace your body’s practice of running. Keep it easy enough that it does not weaken the next run, long run, or rest day.
Sources and methodology
This guide is educational, not medical advice. It is written from general training principles and linked primary or official references; use judgment for your own conditions and consult a qualified professional for individual health concerns. Read our editorial methodology.
- ACSM's Guidelines for Exercise Testing and Prescription — American College of Sports Medicine. General exercise-training principles and progression guidance.
- Physical Activity Basics — Centers for Disease Control and Prevention. Public-health guidance on physical activity and its role in health.
- Nutrition and Athletic Performance — American College of Sports Medicine, Academy of Nutrition and Dietetics, and Dietitians of Canada. Joint position statement on sports nutrition.
- Training-intensity Distribution on Middle- and Long-distance Runners: A Systematic Review — International Journal of Sports Medicine / Thieme. Review of 20 studies supporting substantial low-intensity volume while documenting major differences between intensity-measurement methods.