Marathon Training Plan for Beginners (UK 2026)

Signing up for your first marathon is exciting and a little daunting, but 26.2 miles (42.2 km) is a very trainable distance for an ordinary runner with a sensible plan and enough time. You do not need to be fast, and you do not need to run the full distance before race day. You need a steady build, a long run that grows week by week, and the patience to keep most of it easy. Here is how a beginner marathon plan fits together, plus a sample 16 week schedule you can follow.

Is a marathon realistic for a beginner, and what base do I need?

Yes. A marathon is realistic for most healthy beginners who give themselves enough time and build up gradually. The one thing worth having before you start a marathon block is a running base. As a rough guide, you want to be able to run for about 30 minutes without stopping at an easy, conversational effort, or to be running a regular 5K or 10K, after training consistently a few times a week for at least four to six weeks. If you are not there yet, spend a couple of months building that base with a couch to 5K style plan first, then add the marathon weeks on top.

Building slowly is what protects you. Most first time injuries come from doing too much too soon, so raise your running gently and avoid big jumps in your longest run from one week to the next.

This article is general guidance, not medical advice. If you are new to exercise, returning from injury, pregnant, or managing a health condition, have a chat with your GP before you start, and see a physio if you pick up a niggle that does not settle with a few easy days.

How long does it take to train for a first marathon?

Most beginner plans run for 16 to 20 weeks, with 16 weeks a popular sweet spot if you already have a 5K or 10K base. That is long enough to raise your mileage safely and grow the long run without losing motivation. You will usually run three to five times a week: one long run, a couple of easy runs, and sometimes one slightly faster or hillier session. If life is busy, three or four runs a week is plenty, and consistency across the whole block matters far more than any single big week.

How should my training week be structured?

A good beginner week has a clear shape:

• One long run, usually at the weekend, that grows gradually. This is the most important run of the week.
• One or two easy runs, kept genuinely easy and conversational.
• One optional session with a bit more purpose (some steady miles, gentle hills, or short strides) once you have a few weeks in the bank.
• One or two full rest days.
• One or two short strength sessions, plus a little mobility work.

Rest is not slacking. It is when your body adapts and gets stronger. Strength work, even a short routine two or three times a week for your legs, hips and core, is one of the best evidenced ways to lower running injury risk, so keep it in even during your biggest weeks. A few minutes of mobility after runs helps you recover.

Fitting running, strength, HIIT and mobility around work, family and everything else is the tricky bit. That is what Edge is built for: a fully personalised plan across running, strength, HIIT and mobility, ready in 15 minutes, with a free 7-day trial, then from £19.99/month. If a long run does not fit your week, you can move it, or message a real coach anytime to adjust it, so the plan flexes around your life.

What does a sample beginner marathon plan look like?

This is a sample 16 week plan for a beginner who can already run about 5K comfortably. The distances shown are for the weekly long run. Treat everything else that week as easy running, with rest days and a short strength session around it. Cutback weeks, where the long run drops back, are built in on purpose so your body can absorb the work. If a distance feels like too much on the day, walk and run breaks are completely fine.

Not every week is shown. The long run builds a little most weeks, with a lighter cutback week roughly every third or fourth week. Keep the runs between these markers easy, and do not chase a bigger long run than the plan asks for.

Why does the long run peak below 26.2 miles?

Almost every beginner plan tops the long run out at around 18 to 20 miles, not the full 26.2, and there is a good reason. Running the whole distance in training leaves you very tired and raises your injury risk, without adding much fitness you cannot get from a well judged 20 miler. Your long runs teach your body to burn fuel efficiently, keep going on tired legs and cope with time on your feet. Combined with a proper taper and the buzz of race day, that is enough to carry most beginners through the final few miles. Trust the plan. The extra distance comes on the day.

How should I pace my runs, and what is the talk test?

The most common mistake beginners make is running their easy runs too fast. Most of your weekly mileage, including a lot of the long run, should be easy: a pace at which you could hold a conversation in full sentences. That is the talk test. If you are gasping and can only manage a word or two, you are going too hard. Easy running builds your aerobic engine while keeping fatigue and injury risk low, and leaves you fresh enough to enjoy the occasional faster session. On long runs especially, start slower than feels necessary, and finish tired but not wrecked.

What should I eat and drink on long runs?

Once your long runs pass about 75 to 90 minutes, you will benefit from taking on some carbohydrate and fluid while you run, and long runs are the place to practise it. A common starting point is roughly 30 to 60 grams of carbohydrate per hour, from energy gels, chews, a sports drink or simple snacks like a banana. Gels usually hold 20 to 30 grams each, so one every 20 to 30 minutes is a typical rhythm. Sip fluid regularly rather than gulping a lot at once, and take a little more when it is warm. The golden rule is to test everything in training, never for the first time on race day. Everyone is different, so if you have specific dietary needs or a health condition, a registered dietitian can help you build a fuelling plan that suits you.

What is the taper, and how do I get to the start line?

The taper is the two to three weeks before your marathon when you deliberately cut your mileage right down, often by around 40 to 60 per cent from your peak, while keeping a little light running so your legs stay sharp. It can feel odd to do less so close to the race, but this is when your hard work turns into fresh legs. Use the taper to sort your logistics: plan your kit, rehearse your breakfast, learn the course, and get some early nights. Arrive at the start rested, a little impatient, and confident that the training is already done. Then relax, start slower than you think you should, and enjoy your first marathon.

Frequently asked questions

How long should a beginner train for a marathon, and how far is the longest run?

Most beginners train for 16 to 20 weeks, run 3 to 5 times a week, and build one weekly long run up to about 18 to 20 miles (roughly 29 to 32 km), never the full 26.2 in training, before race day. Sixteen weeks is a popular choice if you already have a 5K or 10K base.

Do I need to run a 5K or 10K before starting?

It helps a lot. Before a marathon block, aim to be running comfortably for about 30 minutes without stopping, or racing a regular 5K or 10K, after training consistently a few times a week for four to six weeks. If you are not there yet, build that base first, then add the marathon weeks on top.

How many days a week should I run?

Three to five is the usual range. A simple, effective week is one long run, one or two easy runs, one optional session with a bit more purpose, one or two rest days, and a short strength session or two. Consistency across the whole block beats any single big week.

Should I run the full 26.2 miles in training?

No. Beginner plans peak the long run at around 18 to 20 miles. Running the full distance in training adds a lot of fatigue and injury risk for very little extra benefit. A good taper and race day adrenaline carry you through the final miles.

How do I avoid getting injured?

Build up gradually and avoid big jumps in your weekly mileage or your longest run, keep most of your running easy, take your rest days, and do a little regular strength work. If you pick up pain that does not settle with a few easy days, see a physio, and check in with your GP before starting if you have any health concerns.