Couch to 5K, 10K, Half Marathon Training Plan Generator

Build a free couch to half marathon training plan from scratch. Also covers couch to 5K and 10K. Beginner-friendly, road and trail, starting from zero.

If you're looking for a couch to half marathon training plan, you're in the right place. And if you've never run a step in your life, that's exactly who this is built for.

This is a free training plan generator for complete beginners — from 5K to half marathon, for both road and trail. No running background required. No fitness baseline. No weekly mileage to enter.

Just pick your race, pick your date, and your week-by-week plan is ready in seconds.

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Can you really go from couch to half marathon?

Yes! and it's more common than you'd think. The half marathon is 13.1 miles, and while that sounds like a long way from someone who's never run around the block, the distance is genuinely achievable for a complete beginner with the right structure and enough time.

The key is starting with run/walk intervals, not continuous running. In the early weeks of any good couch to half marathon training plan, you're not expected to run at all; you alternate short bursts of running with walking breaks.

The running portions get longer week by week. The walk breaks get shorter. At some point, most runners find they've stopped walking entirely and barely noticed it happening.

Most couch to half marathon plans take 16–20 weeks. That's four to five months of gradual, progressive training — enough time for your lungs, legs, and tendons to adapt properly without breaking down.

Couch to 5K: the right starting point

If 13.1 miles sounds overwhelming right now, a couch to 5K plan is the sensible first step. The 5K (3.1 miles) is the standard beginner target, and for good reason — it's achievable in 6–10 weeks, the training is manageable alongside a normal life, and finishing a 5K changes how you see yourself as a runner in a way that makes everything else feel possible.

Our generator covers couch to 5K plans too. Once you've run a 5K, the couch to 10K plan is your next natural step, and from there the half marathon follows the same progressive logic.

When you're more experienced and ready to take on more of a challenge Road or Trail, visit our Master Running Training Plan Generator, to build your training schedule.

How the generator works

Everything in the plan is measured in time, not distance. You'll never be told to run 3.4 miles — you'll be told to run 5 minutes. This removes the pressure of pace entirely and makes the early weeks far less intimidating.

Three training sessions per week, every week. Monday, Wednesday, and Saturday. The Saturday session is always the longest. Rest days are built in between every session — recovery is where fitness is actually built, and this plan treats rest as training.

Walk/Run phase — the first quarter of your plan. Short running intervals alternating with walking breaks. You might run 1 minute and walk 2 minutes, repeated 8 times. That's a complete session. It counts.

Run/Walk phase — the middle section. The running intervals get significantly longer. Walk breaks are still scheduled and still expected. Three minutes of running, then one minute of walking. Then five minutes. Then eight.

Running phase — by this point, most people are running 15–25 minutes continuously without stopping. The walk breaks are optional rather than scheduled. This is when training starts to feel like running.

Taper — the final 1–2 weeks drop the volume so you arrive at the start line fresh and confident rather than tired.

Road vs trail: how the plans differ

Road plans are straightforward — time-based intervals on flat or rolling terrain, focused entirely on building the habit and the cardiovascular fitness.

Trail couch to half marathon plans use the same progressive structure but include specific guidance on power hiking. On trail, walking steep climbs isn't a failure — it's the correct technique, and learning to hike purposefully is a real running skill. Trail plans explicitly build this in from the start rather than treating it as cheating.

Both road and trail plans cover 5K, 10K, and half marathon distances.

How long does a couch to half marathon take?

It depends on your timeline and how many weeks you have until race day. Our generator shows you the earliest realistic race date based on your chosen distance, then lets you pick from the plan lengths that fit your timeline:

Couch to 5K: 6–10 weeks
Couch to 10K: 8–14 weeks
Couch to half marathon: 12–20 weeks (16 weeks is the sweet spot for most beginners)

The generator auto-selects the longest plan that fits your timeline, giving you the most gradual and sustainable progression.

Do I need any gear?

Running shoes are the one essential. Everything else is optional. You don't need a GPS watch (it will certainly help though), a heart rate monitor, or specialist clothing to follow a couch to 5K or couch to half marathon plan. The sessions are all measured in minutes, so a phone timer is all you need.

If you want guidance on running shoes specifically for beginners, my best daily trainers roundup on alastairrunning.com covers exactly that. And for trail running shoes, tap the link below.

How to use the generator

Choose Road or Trail, then tap your race distance — 5K, 10K, or Half Marathon.

Select your race date from the calendar. The generator shows the earliest date that gives you enough time to train properly. Pick your date and the available plan lengths appear automatically. If you're not signed up to a race yet, pick a target date a few months out, you can always adjust it.

Hit Generate My Plan.

Your full week-by-week schedule appears immediately. Each week shows three sessions: Monday, Wednesday, and Saturday. Tap any week to expand it and read the specific instructions for each session.

When you're ready to print, hit Print and the plan formats itself onto a single page you can stick on your fridge.

The rest days are intentional. Don't add extra runs "to speed things up"; the adaptation your body needs happens on the rest days, not during the sessions.