A half marathon training plan should prepare you to cover 21.1 kilometres without requiring you to run the full distance every week. This 12-week plan combines easy running, long runs, controlled faster sessions and recovery weeks to build the endurance needed for race day.
This plan is designed for runners who can already run approximately 5 kilometres continuously and can train four times per week.
The longest training run is 19 kilometres. Training volume increases gradually, every fourth week is easier, and the final two weeks reduce fatigue before the race.
Who Is This Half Marathon Plan For?
This plan is intended for beginner and improving recreational runners who already have a small running base. Before beginning, you should ideally be able to run for approximately 30 to 40 minutes continuously at an easy effort.
You do not need to be fast. The important starting requirement is that your body is already accustomed to running several times per week.
This plan may suit you if:
- You can run approximately 5 km continuously.
- You currently run two or three times per week.
- You have completed a 5K or 10K race.
- You can train consistently for 12 weeks.
- You are not currently dealing with a running injury.
Delay the plan if:
- You cannot yet run for 20 minutes continuously.
- You have only recently started exercising.
- You have recurring pain during or after running.
- You cannot currently train at least three days per week.
- Your race is fewer than eight weeks away.
Spend four to eight weeks building up to three easy runs per week before beginning this plan. A run-walk approach can be used until you are able to complete approximately 5 kilometres comfortably.
How the Training Plan Works
Each week contains four runs with a different purpose. The easy and long runs develop endurance, while the Thursday session gradually introduces hills, intervals, tempo running and half marathon race pace.
| Day | Session | Purpose |
|---|---|---|
| Monday | Rest | Recover from the weekend long run |
| Tuesday | Easy run | Build aerobic fitness with limited fatigue |
| Wednesday | Rest or strength training | Improve general strength and movement capacity |
| Thursday | Quality session | Develop speed, threshold fitness and race pace |
| Friday | Rest | Recover before the weekend |
| Saturday | Short easy run | Add low-intensity volume |
| Sunday | Long run | Build endurance and running durability |
The days can be moved to fit your schedule, but avoid placing the quality session and long run on consecutive days. Try to keep at least one easier day between demanding sessions.
Half Marathon Training Intensities
Most of the plan should feel comfortable. Running every session hard does not produce faster progress. It usually produces unnecessary fatigue and a greater risk of injury.
| Intensity | Effort | How it should feel |
|---|---|---|
| Easy | RPE 2–4 out of 10 | Relaxed and conversational |
| Long run | RPE 3–4 out of 10 | Comfortable enough to maintain for a long time |
| Steady | RPE 5 out of 10 | Controlled but more focused than easy running |
| Half marathon pace | RPE 6 out of 10 | Purposeful and sustainable, but not relaxed |
| Tempo | RPE 6–7 out of 10 | Comfortably hard with controlled breathing |
| Intervals | RPE 7–8 out of 10 | Hard but repeatable without sprinting |
| Strides | Fast and relaxed | Short accelerations with full control |
Heart rate can provide additional guidance, but pace and heart rate are affected by hills, weather, fatigue and hydration. Learn more in our guide to running heart rate zones .
Approximately 75–85% of your weekly running should remain easy enough that you could speak in complete sentences.
12-Week Half Marathon Training Plan
Distances include the complete session. For interval and tempo workouts, begin with easy running and finish with a short cooldown.
| W | Tuesday | Thursday | Saturday | Sunday | Weekly focus |
|---|---|---|---|---|---|
| 1 | 4 km easy | 5 km including 6 × 1 min faster | 4 km easy | 8 km long run | Establish consistency |
| 2 | 5 km easy | 5 km including 6 short hills | 4 km easy | 10 km long run | Build aerobic endurance |
| 3 | 5 km easy | 6 km with 15 min steady | 4 km easy | 12 km long run | Extend the long run |
| 4 | 4 km easy | 5 km easy with 4 strides | 4 km easy | 9 km long run | Recovery week |
| 5 | 6 km easy | 6 km including 3 × 6 min tempo | 4 km easy | 14 km long run | Introduce tempo running |
| 6 | 6 km easy | 7 km including 5 × 3 min intervals | 5 km easy | 16 km long run | Develop aerobic power |
| 7 | 5 km easy | 6 km with 20 min steady | 4 km easy | 12 km long run | Absorb the training |
| 8 | 6 km easy | 8 km including 2 × 12 min tempo | 5 km easy | 18 km long run | Build race durability |
| 9 | 6 km easy | 8 km including 3 × 2 km at half marathon pace | 5 km easy | 19 km long run | Peak training week |
| 10 | 5 km easy | 7 km including 20 min tempo | 4 km easy | 14 km long run | Begin reducing volume |
| 11 | 5 km easy | 6 km including 3 × 1 km at race pace | 4 km easy | 8 km long run | Taper and maintain rhythm |
| 12 | 4 km easy | 4 km easy with 4 strides | Rest or 15 min easy | Half marathon race | Race week |
Distances are approximate. Reduce individual sessions by 10–20% when needed, particularly if you are returning from illness, experiencing unusual fatigue or adapting to four weekly runs for the first time.
How to Complete Each Workout
Easy runs
Easy runs should feel genuinely easy. Their purpose is to build aerobic fitness, improve running economy and increase weekly volume without creating excessive fatigue.
Slow down when necessary. Pace may change from day to day depending on weather, sleep, hills and accumulated training.
Long runs
Long runs gradually prepare your legs, cardiovascular system and connective tissue for the duration of the half marathon.
Complete most long runs at a comfortable conversational effort. You do not need to run them at your intended half marathon pace.
Begin slower than you think is necessary. You can gradually increase the effort during the final kilometres when you feel strong, but the run should never become an all-out race.
Tempo runs
Tempo running develops your ability to sustain a moderately hard effort. The pace should feel controlled enough that you could continue for longer than the scheduled interval.
During a workout such as 3 × 6 minutes tempo, run easily for two or three minutes between each repetition.
Intervals
Intervals are shorter, harder efforts designed to improve aerobic power and running economy. They should be fast but repeatable.
Avoid sprinting the first repetition. The final interval should be difficult but completed with similar form and pace to the first.
Our beginner guide to running interval training explains how to pace and structure faster sessions.
Half marathon race-pace running
Race-pace sessions introduce the rhythm you plan to use on race day. They should feel purposeful but controlled, especially during the first half of each repetition.
Use our half marathon pace chart to find the kilometre or mile pace required for your target finishing time.
Strides
Strides are short, relaxed accelerations lasting approximately 15 to 20 seconds. Gradually increase speed, run fast with good posture and then slow down smoothly.
Walk or jog until fully recovered before starting the next stride. Strides should improve coordination rather than leave you exhausted.
The Four Training Phases
Foundation
Establish four weekly runs, gradually extend the long run and introduce short hills and steady running.
Development
Add tempo running and intervals while continuing to increase endurance.
Peak training
Complete the longest runs and most race-specific workouts of the programme.
Taper
Reduce training volume while maintaining enough intensity to arrive rested and ready to race.
How to Adjust the Plan
A training plan should provide structure without becoming an inflexible set of instructions. Adjustments are normal when work, sleep, illness or unexpected fatigue interfere with training.
-
Prioritise the long run
The long run is the most important race-specific session. Protect it when possible, but reduce the distance if pain or unusual fatigue develops.
-
Keep most easy runs easy
Do not compensate for a missed workout by increasing the intensity of the next easy run.
-
Skip rather than stack sessions
Avoid completing multiple missed workouts on consecutive days. Resume the normal schedule when possible.
-
Repeat a week when necessary
Repeat the previous week when the increase in distance feels too large. Progress does not need to follow a perfect calendar.
-
Do not make up taper mileage
Missed training during the final two weeks cannot be recovered. Arriving rested is more valuable than forcing in additional distance.
Can You Train for a Half Marathon Three Days per Week?
Yes. Three weekly runs can be enough to finish a half marathon, particularly when you already have a basic fitness foundation.
Remove the Saturday easy run and retain:
Easy run
Maintain aerobic volume at a comfortable conversational effort.
Quality session
Alternate between hills, tempo, intervals and race-pace running.
Long run
Gradually develop the endurance required to complete 21.1 kilometres.
Do not significantly increase the remaining sessions to replace the missing run. The reduced plan should contain less weekly volume.
Can You Use a Run-Walk Strategy?
A run-walk strategy can make the plan more manageable and is permitted in most half marathon races. Planned walking intervals are often more effective than waiting until exhaustion forces you to walk.
| Run interval | Walk interval | Suitable for |
|---|---|---|
| 4 minutes | 1 minute | Newer runners building continuous endurance |
| 8 minutes | 1 minute | Runners who can already run comfortably |
| 14 minutes | 1 minute | Experienced runners managing fatigue |
| Walk aid stations | 30–60 seconds | Runners using walking mainly for nutrition |
Use the same strategy during long runs that you intend to use on race day. This allows you to practise pacing, drinking and restarting smoothly after each walking interval.
Strength Training for a Half Marathon
One or two short strength sessions per week can support running durability. Strength work should complement the running plan rather than leave your legs too sore to complete key sessions.
Squat pattern
Squats, split squats and step-ups strengthen the hips, thighs and lower legs.
Hip hinge
Deadlift variations and hip hinges train the glutes and posterior chain.
Calf strength
Straight-leg and bent-knee calf raises strengthen muscles used during every running stride.
Core stability
Carries, planks and controlled anti-rotation exercises support posture as fatigue increases.
Complete strength training after an easy run or on Wednesday. Avoid a demanding lower-body workout immediately before the quality session or long run.
Cross-Training During the Plan
Cycling, swimming, rowing and elliptical training can add aerobic work with less impact than running. Cross-training is optional and should not replace recovery.
Add one easy session of approximately 30 to 60 minutes when you are recovering well. Keep the intensity comfortable and avoid creating fatigue that reduces the quality of your running.
Recovery Between Workouts
Fitness improves when your body adapts to training. More running only helps when you can recover from it.
- Aim for consistent and sufficient sleep.
- Eat enough total energy to support training.
- Include carbohydrate around longer and harder sessions.
- Include protein regularly throughout the day.
- Replace fluid after hot or unusually sweaty runs.
- Use easy days to recover rather than test your fitness.
General muscle fatigue can be normal, but sharp, worsening or gait-changing pain should not be ignored. Reduce or stop running and seek appropriate professional assessment when necessary.
Nutrition and Hydration for Long Runs
Runs lasting less than approximately one hour may not require carbohydrate during the session. As the long run becomes longer, practising race-day nutrition becomes increasingly important.
Before the run
Eat a familiar carbohydrate-rich meal or snack early enough to digest comfortably. Avoid experimenting before an important long run.
During the run
Practise taking carbohydrate and fluid during longer sessions. The exact amount depends on duration, intensity and personal tolerance.
After the run
Eat a normal meal containing carbohydrate, protein and fluid to support recovery.
Race-specific practice
Use the same products, flavours and carrying method you intend to use during the half marathon.
How to Choose a Half Marathon Goal
Your goal should reflect recent training rather than an arbitrary finishing time. A realistic target can be estimated from recent races, long-run fitness and race-pace workouts.
Ambitious result
Use only when training has gone very well and conditions are favourable.
Realistic target
Base this on recent fitness and the pace you have practised in training.
Successful completion
Slow down, use a run-walk strategy or focus on finishing comfortably.
New half marathon runners should usually begin conservatively. A strong final five kilometres is preferable to losing substantial time after an overly aggressive start.
What to Do During Race Week
Race week is designed to reduce fatigue, not create additional fitness. Training volume is lower, but short easy runs and strides help maintain rhythm.
-
Keep running familiar
Use your normal shoes and complete only short, comfortable sessions.
-
Avoid last-minute tests
Do not attempt a hard workout or long run to prove that you are ready.
-
Prepare equipment early
Organise shoes, clothing, race number, nutrition and transport before the final evening.
-
Eat normally
Increase carbohydrate moderately without turning the days before the race into an uncontrolled eating challenge.
-
Accept imperfect sleep
One poor night before the race is common. Consistent sleep during the previous week matters more.
Half Marathon Race-Day Pacing
The first kilometres should feel controlled. Excitement and fresh legs can make your planned pace feel unusually easy, but running too fast early can make the final third substantially harder.
| Race section | Recommended approach |
|---|---|
| 0–3 km | Settle into rhythm and avoid running faster than planned |
| 3–10 km | Maintain controlled goal pace |
| 10–16 km | Stay patient and focus on fuelling and form |
| 16–19 km | Gradually increase effort when you still feel controlled |
| Final 2.1 km | Use the remaining energy and race by effort |
The half marathon begins to reveal its true difficulty after approximately 15 kilometres. Preserve enough energy to continue racing when the early excitement has disappeared.
Common Half Marathon Training Mistakes
Running easy days too fast
This creates fatigue without providing the specific benefits of a properly structured hard session.
Increasing distance too quickly
Your cardiovascular fitness can improve faster than your muscles, tendons and bones adapt to running impact.
Racing every long run
Long runs should develop endurance without requiring several days of recovery.
Skipping recovery weeks
Easier weeks help your body absorb the previous training before volume increases again.
Using new equipment on race day
Shoes, socks, nutrition and clothing should all be tested during training.
Starting the race too fast
Banking time early often leads to a much larger slowdown during the final kilometres.
Frequently Asked Questions
Is 12 weeks enough to train for a half marathon?
Twelve weeks can be enough when you can already run approximately 5 kilometres and train consistently. Complete beginners may need additional time to build a safe running foundation.
How many times per week should I run?
This plan uses four weekly runs. Three runs can also be enough when they include an easy run, a quality session and a long run.
What is the longest run before a half marathon?
The longest run in this plan is 19 kilometres. Many runners prepare successfully with a longest run between approximately 16 and 20 kilometres.
Do I need to run 21.1 km before race day?
No. Running the complete distance in training is not necessary. The combination of consistent weekly volume, long runs and race-specific sessions prepares you to complete the remaining distance on race day.
Can I walk during the half marathon?
Yes. Planned walking intervals or walking through aid stations can be an effective pacing strategy, particularly for first-time runners.
Should I run the long run at race pace?
Most long runs should be slower than half marathon race pace. Selected sections can be run at a steady or race-specific effort, but the entire run should not become a race.
What should I do if I miss a week?
Resume from the most recent manageable week rather than jumping immediately to the current schedule. Do not try to complete all missed sessions.
Can I replace a run with cycling?
Easy cycling can replace an occasional easy run and maintain aerobic training. It cannot completely replace the running-specific durability developed through regular impact and long runs.
When should I stop strength training before the race?
Reduce lower-body strength volume during the final one or two weeks. Avoid unfamiliar exercises or demanding sessions that could create soreness close to race day.
What half marathon time should a beginner aim for?
There is no single correct beginner time. A realistic goal should be based on recent 5K or 10K performances, training pace and whether your main objective is racing for time or completing the distance.
Final Takeaway
A successful half marathon plan gradually increases endurance while keeping most running comfortable. The long run prepares you for the distance, faster sessions improve your ability to sustain pace, and recovery weeks allow your body to adapt.
You do not need to complete 21.1 kilometres before race day or run every workout at your target pace. Consistency across the full 12 weeks is more valuable than one exceptional session.
Begin conservatively, adjust the plan when necessary and arrive at the starting line healthy enough to use the fitness you have built.
The best half marathon training plan is not the hardest plan you can survive. It is the plan you can complete consistently while recovering, remaining healthy and gradually becoming more prepared.
