Best Half Marathon Training Apps for Garmin UK 2026: 6 That Push Workouts to Your Watch

Half marathon basics: what your Garmin needs to do

A half marathon is 13.1 miles, or 21.1 kilometres. Most plans last 12 to 16 weeks. A beginner plan asks for three runs a week. An intermediate plan asks for four to five. An advanced plan can push to six runs plus strength work.

Here is the part that matters for Garmin owners. A half marathon plan is not just a list of distances. It is a mix of:

• Easy runs at a conversational pace
• Long runs that build endurance up to 10-12 miles
• Tempo runs at "comfortably hard" pace
• Intervals with timed work and rest blocks
• Strides at the end of easy runs
• Race-pace work close to your goal half marathon pace

The interval and tempo sessions are the ones where a good Garmin app earns its keep. Instead of staring at your wrist trying to remember "400m hard, 200m jog, eight times," the watch beeps and vibrates when each segment starts and ends. That is the difference between a guessed session and a real session.

What makes a great Garmin half marathon app

Not every app that says it "works with Garmin" actually pushes workouts to the watch. Some just import your runs after the fact. Here is the checklist we used.

1. Structured workout push to the watch

The app sends each session to your Garmin as a structured workout. You open the workout on your watch, tap start, and the watch coaches you through every interval. This is the single most important feature.

2. Two-way sync

After the run, your completed session syncs back into the app so the next session can adapt to how the last one went.

3. Race-specific structure

A proper half marathon plan builds long runs, adds race-pace miles inside those long runs, and tapers in the final two weeks. A generic "run more" plan does not count.

4. Adaptive logic

If you nail a tempo session, the next one should get harder. If you struggle, it should ease off. Static PDF plans cannot do this. Modern apps can.

5. UK-friendly

Units in miles or km, paces in min/mile or min/km, weather aware of British rain, and ideally a price in pounds.

The 6 best half marathon apps for Garmin in the UK

1. Edge: Best for hybrid half marathon training

Who it is for: Runners who also want to keep lifting, cross-training, or doing HIIT alongside their half marathon plan. People who do not want to give up the gym to chase 13.1 miles.

What you get: A coach-built plan delivered within 24 hours of signing up, written by a real human coach and enhanced by AI to adapt week by week. The plan blends running, strength, and HIIT training in a way that supports your half marathon goal rather than fighting it. Every running session, including intervals and tempos, pushes to your Garmin as a structured workout. The native Apple Watch app handles strength sessions if you wear an Apple Watch on the strength days, and completed sessions import back into Edge so the next week adjusts to how the last one went.

Why it stands out for Garmin owners: Edge is one of the very few apps that takes hybrid training seriously and still treats your Garmin as a first-class device. Most "hybrid" apps either ignore the watch or push junk data. Edge sends real, race-specific structured workouts to Forerunner and Fenix watches, then pulls the completed run back in so your coach can see exactly what happened.

Member base: 17,000+ members training right now.

Pricing: Free seven-day trial, then a single monthly subscription that covers running, strength, and HIIT in one app.

Tagline that fits: Train your way. Fun, flexible training that fits your life.

2. Garmin Coach: Best free option

Who it is for: First-time half marathoners who already own a Garmin and want a free, no-fuss plan straight on the watch.

What you get: Pick a coach (Greg McMillan or Amy Parkerson-Mitchell are the two most popular for half marathon), enter your goal time and race date, and Garmin Connect builds a plan and pushes every session to the watch automatically. The plan adapts based on how your sessions go.

Strengths: It is free with any Garmin account. The integration is perfect because it is built by Garmin. The workouts arrive on the watch with zero setup.

Weaknesses: Running only. No strength, no HIIT, no cross-training. Limited customisation: you cannot easily move sessions around when life gets in the way. The coach personalities are friendly but the plans themselves are fairly standard.

Pricing: Free.

3. TrainingPeaks: Best for coached athletes targeting PRs

Who it is for: Runners working with a real human coach who wants to write bespoke sessions and analyse every metric afterwards.

What you get: A calendar-driven planning tool that coaches use to build sessions. Each workout pushes to Garmin and the post-run analysis is the deepest of any app on this list.

Strengths: Industry standard for serious athletes. Coach-friendly. Detailed analytics including TSS, CTL, and ATL.

Weaknesses: Without a coach writing your plan, the app is just an empty calendar. The premium subscription is needed for structured workouts to push to Garmin. The interface is more spreadsheet than coach.

Pricing: Premium plan needed for full features, roughly £15-£20 a month, plus your coach's fee on top.

4. Runna: Best running-only with chatty audio plans

Who it is for: Runners who only want to run, and who like a friendly voice in their ear during sessions.

What you get: A run-only half marathon plan that pushes structured workouts to Garmin and plays audio cues through your phone or earbuds during the session. The vibe is chatty and supportive.

Strengths: Slick onboarding. Strong UK following. Audio guidance is genuinely helpful for first-time half marathoners. Garmin push works well.

Weaknesses: Running only. If you also lift weights or do HIIT, you have to manage that separately. Some sessions can feel template-driven rather than truly personal.

Pricing: Around £18-£20 a month after a free trial.

5. Hal Higdon: Best free classic plans

Who it is for: Runners who trust a proven plan and do not need bells and whistles.

What you get: Hal Higdon's Novice 1, Novice 2, Intermediate 1, Intermediate 2, and Advanced plans are some of the most-followed half marathon plans in the world. The PDF versions are free. There is also a paid app version that can sync sessions to Garmin.

Strengths: Free in PDF form. Decades of proven results. Simple enough that you can follow it on a printout pinned to the fridge.

Weaknesses: The PDF does not push to Garmin. To get structured workouts on the watch you need the paid app or you have to build each workout in Garmin Connect yourself.

Pricing: Free PDFs, or around £4 per plan inside the official app.

6. Final Surge: Best free TrainingPeaks alternative

Who it is for: Coached athletes or self-coached runners who want TrainingPeaks-style planning without paying for premium.

What you get: A planning calendar very similar to TrainingPeaks, with structured workout push to Garmin included on the free tier.

Strengths: Free structured workout push, which is rare. Coach-friendly. Decent analytics.

Weaknesses: Smaller user base means fewer coaches use it. Interface is dated. Mobile experience is weaker than TrainingPeaks.

Pricing: Free, with optional premium upgrades.

Interactive picker: which Garmin half marathon app is right for you?

Answer four quick questions and we will point you at the best fit. Nothing is sent anywhere, the picker just shows the recommendation on screen.

Pricing and features comparison

How Edge pushes half marathon workouts to your Forerunner or Fenix

Here is the bit a lot of guides skip. We will walk through what actually happens when Edge sends a structured half marathon workout to your Garmin.

1. You finish onboarding. You tell Edge your race date, your goal, your current weekly mileage, and how much strength or HIIT you want alongside the running.
2. Your coach builds the plan. Within 24 hours a real coach delivers your full plan inside the app. It includes long runs, tempo runs, intervals, easy days, strength sessions, and HIIT blocks.
3. You connect Garmin. A one-tap connection links your Garmin Connect account to Edge.
4. Sessions arrive on your watch. Every running session in your plan is pushed to your Garmin as a structured workout. The watch shows the day's session on the calendar.
5. You run the session. Open the workout on your Forerunner or Fenix, tap start, and the watch beeps you through each interval, each rest, and each tempo block.
6. Data flows back. When the run finishes and syncs, the completed session imports back into Edge so your coach can see what really happened and the AI can adapt next week's plan.
7. Strength and HIIT happen alongside. Strength sessions live in the Edge app itself, with a native Apple Watch app for timing if you wear one on lifting days.

That loop, plan to watch to run to plan, is what separates a real Garmin app from one that just opens links.

Why hybrid trainers pick Edge for their half marathon

Most half marathon plans tell you to drop strength training. That works for elite runners. It does not work for the millions of UK runners who also want to keep their gym progress, their HIIT classes, or their general athleticism.

Edge is built for that exact runner. Here is why hybrid trainers keep choosing it for half marathon prep.

• One plan, all of it. Running, strength, and HIIT live in the same plan, written together so the hard days do not collide.
• A real coach. Your plan is built by a human coach within 24 hours, not a template generator.
• AI on top. Once the plan exists, AI helps it adapt. If you smashed Tuesday's intervals, Saturday's long run gets a touch more race-pace work. If you struggled, it backs off.
• Garmin is treated properly. Structured running workouts push to Forerunner and Fenix. Strength is tracked separately so it does not pollute your running data.
• Apple Watch friendly too. If you wear an Apple Watch on strength days, the native Edge app handles set timing and rest.
• It fits your life. Train your way. Fun, flexible training that fits your life. Move sessions around, scale them, skip a day when work gets mad. The plan re-balances.

Edge has 17,000+ members training right now, a lot of them in the middle of half marathon blocks. If you are the kind of runner who wants to cross the finish line at 13.1 miles without losing the rest of your training, Edge is the obvious pick.

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Keep reading

• Best Garmin Training Apps UK 2026
• 12-Week Half Marathon Training Plan for Beginners UK 2026
• Best Half Marathon Training Apps UK 2026 Tested
• Edge vs Garmin Coach: Honest Comparison UK 2026