This guide is designed for complete beginners aiming to run their first-ever half marathon. Whether you’ve never run before or you’re just getting back into it. Starting from a true beginner baseline, it will help you find the right starting point and choose the best training plan for you. You’ll learn how to build up gradually, understand effective training structure, and get practical tips on everything from nutrition to choosing the right running shoes. Your half-marathon story starts right here.
Why run a half-marathon?
So you're thinking about a half-marathon. Maybe someone mentioned it in passing, maybe you saw a race and felt that pull in your chest - that mix of "I could never" and "...could I?" Spoiler: you could.
Here's what makes the half-marathon the perfect starting line for your running journey. It's far enough to feel like a genuine achievement, something you'll want to shout about from the rooftops, but it's not so daunting that it feels out of reach. You don't need to be a seasoned runner. You don't need a running background. You just need the desire to try, a plan to follow, and the courage to show up.
More than just 13.1 miles
Training for a half-marathon does something quietly powerful to you. Yes, you'll build real cardiovascular fitness and endurance - your body will change in ways you'll notice. But the bigger shift? It's mental. There's something about committing to a goal this size that rewires how you see yourself. You stop being someone who wants to be a runner and start being someone who just... runs.
It gives your week structure. It gives your mornings purpose. And on race day, when you cross that finish line, it gives you proof, concrete, undeniable proof, that you're capable of more than you thought.
The journey from couch to half-marathon
Before you worry about distance, focus on consistency. The biggest mistake beginners make is going out too hard, too fast - it leads to burnout, injury, and giving up before the training even gets going. Keep your early runs super easy. If you can hold a conversation while running, you're at the right pace and walk when you need to.
Building gradually: Couch to 5K
Before the half-marathon, there's a first step that matters just as much, and that's a 5K.
If you're coming from the couch with zero running background, that's not a problem. It's actually the perfect place to start. But jumping straight into half-marathon training before you've built any base is the fastest route to burnout, injury, or just dreading every single run. So we're not going to do that to you.
Instead, we built the Start Running plan, and it's designed specifically for people starting from absolute zero. No running background. No base fitness. No experience required. Just you, your trainers, and the willingness to give it a go. Plus, it’s completely free!
It works by taking you through run/walk intervals, short bursts of running broken up with walking, and gradually building you up until you're running continuously and comfortably. No overwhelming mileage jumps. No pressure to keep up with anyone else. Just steady, manageable progress at a pace that works for your body and your schedule.
By the time you complete it, you will be absolutely ready for half-marathon training.
The Start Running plan will get you:
• From zero to running continuously without stopping.
• A solid base of fitness to build your half-marathon training on.
• Stronger muscles and joints - reducing your injury risk before the real work begins.
• Confidence that running is actually something you can do.
The half-marathon plan
When you can continuously run 5K without stopping, you're ready to dive into the half-marathon plan! Don't worry about a specific time or pace, just that you can run 5K continuously.
Not there yet? That's exactly what the Start Running plan is for - it'll get you to that point. And if you're already there? Even better. Let's get started.
Why we recommend two plans for couch to half-marathon
Going from the couch to a half-marathon is a big leap, and we want to make sure you actually make it there, feeling good, not burnt out or injured on the sidelines.
Here's why this matters: your cardiovascular fitness improves quickly. A few weeks in and you'll already feel fitter, stronger, more capable. But your muscles, tendons, and joints? They work on a much slower timeline. They need gradual increases in mileage to build the resilience that half-marathon training demands. The Start Running plan does the foundational work first. It conditions your body progressively, building it up to a point where half-marathon training feels like a natural next step
The result? A smoother progression, a significantly lower risk of injury, and a training experience that actually feels manageable.
A plan that adapts to you: How to personalise your plan as a beginner
The training plan will be personalised to your needs. Here are a few ways you can optimise the plan to be as beginner-friendly as possible:
• Your training preferences (volume and difficulty): As a beginner, it's tempting to do too much too soon. Runna lets you set the right volume and difficulty for your level, and you can adjust this at any point as you get stronger and more confident. Start manageable, build gradually.
• Choose your schedule: Pick the days that work for your lifestyle and decide how often you want to run each week. And if plans change? No worries, you can rearrange your runs whenever you need to.
• Strength, Stretch & Stability, Yoga, Pilates: Alongside your runs, you can add cross-training sessions directly into your plan. For beginners, especially, these are what keep your body strong, mobile, and resilient enough to handle the increasing mileage week on week.
• Ability level: Your plan is built around your inputted ability level and running history, making sure you start at exactly the right point for you.
• Any injury history: If you've had any previous injuries, don't worry - you'll have the option to input these upfront, and the plan will take them into account when building your training.
• Pace insights: Runna continuously monitors your training and ensures your pace targets are correctly aligned with your current performance. If we detect a clear trend across your speed sessions, we'll recommend an adjustment to keep your training working for you.
• Strength, Stretch & Stability, Yoga, Pilates: Alongside your runs, you can add cross-training sessions directly into your plan. For beginners, especially, these are what keep your body strong, mobile, and resilient enough to handle the increasing mileage week on week.
Top tips for first-time half-marathon runners
Start slower than you think you need to. Seriously, slow down. Then slow down a little more. Almost every beginner goes out too fast, and almost every beginner regrets it. Easy miles now mean stronger miles later. And remember: progress isn’t always linear. Some runs will feel amazing, others won’t, and that’s completely normal.
Fuel and hydrate properly - before, during and after
Especially on longer runs, your body needs fuel to keep going. Don't wait until you're thirsty or tired to think about it, by then, it's already too late. Practice your nutrition strategy in training, not on race day.
Invest in a good pair of running shoes
You don't need to spend a fortune, but your shoes are the one piece of kit worth getting right. Ill-fitting shoes are one of the most common causes of beginner injuries and are entirely avoidable. Check out this blog on the best running shoes for beginners, or read here about how to choose the best running shoes. It’s so important to find the right pair for you!
Listen to your body
Rest days are part of training, not a break from it. If something feels off, take the hint. Pushing through pain rarely ends well.
A library of knowledge
Check out Runna’s hub of blog content specific to beginners here. We've put together a full library of beginner resources to support you along the way, covering everything from training advice to gear, nutrition, and beyond.
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