How to Train for a Half Marathon: 12-Week Coach’s Guide
Photos by Marques Jackson Photography.
By Marnie Kunz
Certified trainer and run coach
Learn how to train for a half marathon and you’ll be toeing the start line in no time. As a running coach, I have trained many people for half marathons, including my first training group, which was beginning runners training for the Vegas Half Marathon. I can help you get to the finish line withmy best training tips based on the people I’ve trained as well as my own experience running half marathons.
Related Post: All Your Half Marathon Questions Answered
Half Marathon Training: Quick Guide
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I enjoyed running the Paris Half Marathon.
What I love about half marathons is they are challenging and require you to step up your endurance and fitness game without the intense hours and toll on your body that marathons can take. If you’re training solo, a half marathon can be the perfect running distance to keep you motivated without getting overwhelmed. 5K? Been there, done that, and got too many shirts. Half marathon? Bragging rights and a sense of accomplishment. And maybe a dope medal or raising funds for your favorite charity.
What Is A Half Marathon?
First off, if you’re new to running, you may be wondering exactly how far is a half marathon. A half marathon is 13.1 miles, about 21 kilometers. This is equal to exactly half of a full marathon, which is 26.2 miles or 42 kilometers. The half marathon is an endurance race and is a great test of stamina and mental toughness without requiring the long recovery time of a marathon.
How Many Weeks Do You Need to Train for a Half Marathon?
The ideal training timeline for a half marathon depends on your current fitness level, running experience, and weekly base mileage:
16 Weeks (New Runners/Beginners): Recommended if you are brand new to running or coming off a long break. A 16-week timeline gives your body ample time to build a solid aerobic base, adapt muscles and joints to impact, and reduce injury risk.
12 Weeks (Most Runners & Recommended Sweet Spot): Ideal if you can currently run or run/walk 3 miles continuously. A 12-week schedule offers the optimal balance of gradual mileage progression, strength building, and a proper 2-week taper. If you want a structured, step-by-step roadmap designed by a certified coach, check out our popular 12-Week Half Marathon Training Plan.
8 Weeks (Intermediate Runners or Express Prep): If you already have a solid running foundation logging 15+ miles per week and are comfortable running 6 miles at a time, an 8-week block is enough to sharpen speed and build race-day endurance. If you're on a tighter timeline, you can grab our Free 8-Week Beginner Half Marathon Plan to kickstart your training.
How Far Should You Be Able to Run Before Training for a Half Marathon?
Before jumping into a half marathon training cycle, you need a baseline level of fitness to safely absorb the increased mileage and protect your joints from injury. You do not need to be super fast, but you should have a basic running foundation established before Day 1 of your plan.
Here are the prerequisite base fitness requirements before starting your half marathon prep:
Continuous Distance: You should be able to run or use a run/walk method for 3 miles (or 5K) continuously without needing extended rest stops.
Weekly Base Mileage: You should comfortably log around 8 to 10 miles per week across 2 to 3 runs for at least 3 to 4 weeks prior to starting your official training block.
Consistency: Having 1 to 2 months of regular, low-intensity running under your belt ensures your tendons, ligaments, and muscles are conditioned for the repetitive impact of longer distances.
Ready to Conquer 13.1 Miles?
Get the complete, step-by-step 12-Week Half Marathon Training Plan designed by NASM & USATF-certified Run Coach Marnie Kunz. Includes structured running schedules, speed training workouts, and coach's tips.
Download Your 12-Week Training Plan →Instant PDF Download • Lifetime Access
How Many Days a Week Should You Run for Half Marathon Training?
To train effectively for a half marathon without overtraining or burning out, most runners do well with running 3 to 5 days per week. Running 4 days a week provides the ideal balance of mileage progression, cardiovascular development, and crucial recovery time for your muscles and joints.
While advanced runners may log 5 or 6 running days weekly, a 4-day structure is the sweet spot for beginner to intermediate runners aiming for a successful race day.
The Ideal 4-Day Weekly Running Schedule Breakdown
A balanced half marathon training week includes different types of runs, each serving a specific purpose:
2 Base Runs (Build Fitness & Recover): Run at a light, conversational pace (where you can speak full sentences without gasping). Easy runs build aerobic endurance, increase capillary density, and add weekly volume without stressing your body.
1 Speed or Tempo Workout (“Hard” Training Days): Incorporates interval training, hill repeats, or tempo runs at your target half marathon pace. This session improves your lactate threshold, running economy, and mental toughness.
1 Long Run (Endurance Builder): The most important workout in your weekly schedule. Do your long run at an easy, relaxed pace, which gradually builds your physical stamina and mental confidence for covering 13.1 miles.
1 to 2 Cross-Training Days: Low-impact activities like cycling, walking, swimming, rowing, or yoga strengthen your cardiovascular system while giving your running muscles and joints a break from impact.
1 to 2 Full Rest Days: Essential for muscle repair and injury prevention. Adaptation and fitness gains happen when your body recovers, not while you are running.
| Day | Half Marathon Training Sample Week |
|---|---|
| Monday | Rest Day or Light Walk |
| Tuesday | Easy Run (3–5 Miles) + Bodyweight Core Work |
| Wednesday | Speed or Tempo Workout (4–5 Miles) |
| Thursday | Cross-Training (30–45 Mins Cycling or Swimming) or Rest |
| Friday | Easy Run (3–4 Miles) |
| Saturday | Weekly Long Run (Progressive Distance) |
| Sunday | Rest Day or Active Recovery (Light Walking & Stretching) |
How to Build Your Weekly Half Marathon Long Run
The weekly long run is the single most important workout in your training schedule. It conditions your cardiovascular system, builds muscular endurance, and prepares your body to handle the physical and mental stress of running 13.1 miles.
To safely build your endurance without triggering overuse injuries, follow the 10% Rule of Progressive Overload: never increase your total weekly running mileage or your single long run distance by more than 10% from the previous week. Every 3 to 4 weeks, schedule a “step-back week” where you reduce your long run distance slightly to allow your body to absorb the training and fully recover.
Why Your Longest Run Only Needs to Be 10 or 11 Miles
A common misconception among first-time half marathoners is that you must run the full 13.1-mile distance in training before race day. In reality, capping your longest training run at 10 to 11 miles is plenty to prepare you for the finish line.
The reason comes down to time on your feet:
- Training Pace vs. Race Pace: Your weekly long runs should be executed at a slow, comfortable, conversational pace—typically 45 to 90 seconds per mile slower than your target race pace.
- Equivalent Time Exposure: Because you run your training long runs at a slower pace, running 10 or 11 miles in practice often takes roughly the exact same amount of time as running the full 13.1 miles at your faster, tapered pace on race day.
- Injury Prevention: Pushing past 11 miles at a slow training pace offers diminishing fitness returns while drastically increasing muscle breakdown, fatigue, and recovery time.
By building up to a 10- or 11-mile long run 2 to 3 weeks before your event, your body gets all the physiological adaptations it needs while leaving your legs fresh and hungry for race day.
What Pace Should You Run Your Training Runs?
Most of your weekly training miles - especially long runs - should be at an easy, conversational pace (Zone 2), which is typically 45 to 90 seconds per mile slower than your target half marathon race pace. Running at this comfortable effort builds your aerobic endurance, burns fat efficiently, and conditions your joints without causing excessive muscle breakdown. If you cannot speak in full sentences without gasping, you are running too fast.
Run your target race pace on your tempo runs and speed workouts to build lactate threshold and mental toughness. By keeping easy days truly easy, you preserve energy and fresh legs so you can hit your goal pace on race day.
Half Marathon Gear - What You Need to Get Started
You'll need the right gear to train for a half marathon. Luckily, you don't need a lot - just comfortable running shoes and some moisture-wicking clothing. Here's the rundown on what you need:
Running shoes that fit well and are not worn. Change your running shoes every 300 to 500 miles, when they start to feel flat and worn on the bottom. This will help prevent injuries and keep you running strong.
Moisture-wicking running clothes to keep you comfortable on the run.
Long run accessories such as a running backpack, belt, or hydration vest will give you a place to stash your running fuel. Some gear comes with a water bottle or bladder or you can use a handheld water bottle.
Related Post: Best Running Belts Based on Wear Tests
What Is the Best Half Marathon Training Schedule for Beginners?
The best training schedule for beginners follows a 12-week progressive structure that gradually builds your endurance while safeguarding you against injury. A well-designed half marathon training plan balances weekly runs, incorporating easy base miles, speed workouts, and a weekend long run. A smart training program will also include dedicated cross-training and full rest days to allow your muscles to rebuild.
Instead of following a generic, static schedule, having a detailed roadmap created by a certified coach will help you hit race day strong, healthy, and prepared. To get the exact day-by-day workouts, mileage progressions, and recovery guidelines, download our complete, coach-designed 12-Week Half Marathon Training Plan.
This 12-Week Half Marathon Training Plan for Intermediate runners will help you go from running 10K (or 6 miles) to a half marathon in 12 weeks. The program will build your endurance gradually with a weekly long run and regular base runs. There are two speed workouts per week to help you get faster.
This program is for intermediate runners who can currently run 6 miles (or 10K). If you want to build your speed and endurance for your next half marathon, this 12-week half marathon training plan has the blueprint you need to crush your race.
If you’re a beginner, check out our 10K Training Program to build your endurance for this program.
The half marathon training plan is designed by Runstreet founder Marnie Kunz, a NASM-certified personal trainer and USATF- RRCA-certified running coach.
Best Half Marathon Training Principles
If you want to know how to train for a half marathon, there are a few general training principles to follow. First is to build miles and intensity gradually. If you are just starting out running, you should run for at least 5 to 6 weeks of base runs before you start doing any speed workouts. This allows you to build your fitness base so you’re prepared for the intensity of speed workouts. Follow a training plan that increases your weekly mileage slowly to minimize your risk of injuries while pushing you to build endurance.
When you add miles to your program, make sure it is gradual. You don’t want to add more than 10 percent more miles to your training program from the week before, according to the National Academy of Sports Medicine. So if you run 20 miles in a week, you can add up to 10 percent - or 2 miles - to run 22 miles the next week. Use this principle for your long runs as well, adding only 10 percent more to your long runs each week as you build endurance.
How to Train for a Half Marathon
Here’s how to train for a half marathon:
These half marathon tips will help you train smart.
1. Pick a race date.
Find a half marathon date that fits your schedule. Take your current fitness level into account, and allow at least 12 weeks to train if you’re currently running less than 10 miles a week or if this will be your first half marathon. If you’ve been running regularly and are up to at least 6 miles for your longer runs, you’ll want at least 8 weeks to train for a half marathon. Setting a realistic race date will help you create a half marathon training schedule that you can tackle.
2. Get a training plan.
You can create find a half marathon training plan, or hire a coach to make you a customized training plan. The important thing is to get a plan that fits your current fitness level, your race timeline, and your availability for workouts.
Your half marathon training program should suit your fitness goals and abilities. For new runners, you won't need speed work in your plan, but you will need weekly long training runs to build your endurance for race day. A training plan that builds gradually will help prevent overuse injuries while preparing you for your first race.
For more experienced runners, your intermediate half-marathon training plan should have easy runs, and speed sessions like intervals, tempo runs, and fartlek workouts. These speed sessions will help you tap into your goal race pace so you're ready to hit your goal time on race day.
Related Post: Best Half Marathon Workouts to Get Faster
3. Schedule your long runs.
Long runs are the core of any half marathon training problem so planning when to do them is key. Most people pick a weekend day like Saturdays or Sundays to do their long runs, but any day that you’re off work and have a few hours will be fine. Try to do your long run on the same day each week for consistency and to allow yourself enough recovery time.
For first-time half marathoners, when you start your program, your long run may be only a few miles. But by the end of your training, you’ll need a few hours to complete your 10- or 12-mile long runs. Keep this in mind and pick a day that you have plenty of downtime for your weekly long run.
4. Take rest days.
Rest days are vital to allow your body to rebuild and recover from long runs and hard workouts. Make sure you always have a rest day or easy recovery day on the day after every long run. You never want to do two hard workouts (such as a long run and a speed workout) two days in a row.
5. Fuel up.
Stay hydrated by drinking plenty of water throughout your training days. You'll also need electrolytes to replenish lost sweat on long runs and hot and humid days. You can use a sports drink or electrolytes tablets for rehydrating on the run.
In addition, for your longer runs, you’ll need to take some sort of energy gel or fuel. I recommend my coaching clients take fuel on any runs over an hour or over 6 miles. There are lots of running fuel options to give you the electrolytes and calories you need to stay energized on your long run.
If you don’t know what fuels work best for you, try different ones in your training until you find one that is easy to digest and effective. Some people prefer real food — such as a banana or small peanut butter sandwich — and that’s an option you may want to try as well.
Training for a half marathon takes some planning.
6. Plan your run routes.
Using a tool like MapmyRun, you can create or share running route maps and measure the distance you need to go for each of your training runs. Mapping out your routes is especially useful for longer runs as you get into double-digit miles. You can also plan out places to stop for water or fuel or make sure restrooms are on your route. Check out some of our travel running posts for route ideas in NYC, LA, Vegas, Paris, London, and more.
7. Share your progress.
What runner doesn’t love sharing their runs and getting cheered on? Whether you're a beginner runner or an elite athlete, getting support for your training is great motivation. Follow and tag @Runstreet on Instagram to get cheered on for your run posts, and to get inspired.
8. Cross-train.
Doing strength training and cross-training will help make you a stronger runner and prevent injuries. Build some cross-training into your training program by doing yoga, cycling, walking, or some other activity you enjoy at least once a week. This will give your body and mind a break from running while keeping your fitness level up.
For strength training, you can do bodywieght exercises like lunges, push-ups, squats, and planks for a full-body workout without haveing to go to the gym. Work with what you have and you can always add weights to your training session as your fitness level increases.
Related Post: Cross Training Guide for Runners
9. Taper.
As your big half marathon race day approaches, you will need to start tapering. In the two weeks leading up to race day, you’ll want to reduce your running mileage and only do medium or low-intensity runs. Check out our tapering guidelines for more tips on how to taper before your half marathon.
10. Mentally prepare.
You’ve probably heard the saying that running is 90 percent mental, and there’s a reason it’s so popular — it’s true. Racing requires a lot of mental discipline and confidence to make it through all the miles. A great way to prepare mentally for your race is to use mantras in your training. Repeat positive phrases to yourself as you run or when you hit challenges, such as saying “I am strong and I run long,” when you feel tired or are going up a hill. The more you use mantras, the more they will kick in and naturally help you in your running and half marathon.
11. Enjoy!
Have fun in your half marathon! Remember you are doing it for fun and fitness, so don’t forget to savor the moment and enjoy.
Ready to Conquer 13.1 Miles?
Get the complete, step-by-step 12-Week Half Marathon Training Plan designed by NASM & USATF-certified Run Coach Marnie Kunz. Includes structured running schedules, speed training workouts, and coach's tips.
Download Your 12-Week Training Plan →Instant PDF Download • Lifetime Access
Frequently Asked Questions
How long do you have to train for a half marathon?
The exact amount of time you need to train for a half marathon depends on your fitness level and race goals. Most beginners need 12 weeks to train for a half marathon, while intermediate runners usually need 8 to 12 weeks. Your longest run should be about two weeks before your race so your body has time to taper and recover for race day.
How should a beginner train for a half marathon?
Following a beginner's half marathon training plan will help you minimize your risk of injuries and train smart. A coach-designed training program helps you build endurance and mental strength so you can conquer 13.1 miles on race day.
What should I do if I miss a week of half marathon training?
If you miss less than a week due to illness, travel, or busy schedules, simply pick up where your schedule currently is—do not try to "make up" missed miles by doubling workouts. If you miss two consecutive weeks, step back your mileage by 1 to 2 weeks to allow your body to re-adapt safely.
What should I eat before and during a half marathon?
Eat an easily digestible, high-carbohydrate meal 2 to 3 hours before running—such as a toasted English muffin or plain bagel with a light spread of peanut butter and half a banana. During runs lasting longer than 75 minutes, take 30 to 60 grams of fast-digesting carbohydrates (like energy gels or chews) every 30 to 45 minutes with water.
Can I walk during my half marathon training and race?
Yes! Using a structured run/walk method (such as running for 3–5 minutes and walking for 1 minute) is a highly effective strategy for beginners and endurance runners alike. Planned walk breaks reduce heart rate, lower muscle fatigue, and help you finish strong.
How do I know if my running shoes need to be replaced before race day?
Most quality running shoes last between 300 to 500 miles. If you notice unusual joint pain in your knees or shins, or if the tread on the bottom of your shoe is worn flat, replace them at least 4 to 6 weeks before race day so you can comfortably break in your new pair.
If you need a half marathon training program to help you run your dream race, visit the Runstreet Training Center.
Tag @Runstreet on Instagram to share your workouts and get cheered on. Happy running to you!😊
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Marnie Kunz is a NASM-certified trainer and USATF- and RRCA-certified running coach based in Brooklyn, a dog lover and Akita mom, and the founder of Runstreet.
