Half Marathon 13.1 Trainer

Half Marathon 13.1 Trainer

21K Run Walk Training by C25K®

5.6K ratings
185 reviews
Free
In-App PurchasesWith Ads

Details

  • Released
  • Updated
  • April 19, 2012
  • August 24, 2026

Features

Background Location Access

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About

This app guides beginners through a 14-week program to train for a half marathon using a run-walk method. It offers audio coaching, progress tracking, and community support to help users complete their first 13.1-mile race.

✓14-week run-walk training program
✓Audio coach and alerts
✓Run mapping
✓Health app integration
✓Community forums
✓Music integration
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What users say

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What's New in Half Marathon 13.1 Trainer

6.5.31

August 24, 2026

◎ New Apple Watch App ◎ Minor bug fixes and optimization Our community is our number one priority. We answer each and every email. Most of our updates have been suggestions from our community. Questions? Comments? Suggestions? See why our community has made us the #1 5K training app. contactus@zenlabsfitness.com

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Subscriptions & In-App Purchases

Zen Unlimited Pass Monthly

Music, stats, & pro features in all our apps!

$4.991 Month
1 Month trial
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User reviews

Great experience

I have done this program twice, both times started very overweight (like 290 lbs) and limited running. I stuck with the program, forced myself through it, and was able to run a half marathon at <10 min miles by the end - I also lost a ton of weight. My cross training days were weight lifting, stair master, and/or peloton
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Great help and motivation

It was great having the voice telling me when to start and stop.

Great start

I liked how user friendly it was while running. I appreciate the features that are available for free.

BEST. RUNNING. APP. EVERRR!!

I first used the 5k version and it got me into running 5k without stopping and went from a 1hr PR to a 34min PR!
Now I’m training for my first half marathon and I know I’m going to kill it thanks to this training plan.
The 5k is free and it got me here, the subscription is completely worth it for this one!
You can play your own music no interruptions, it doesn’t have annoying ads, connects directly with your Apple Watch and strava! I can’t recommend this app enough!
I got all my cousins running now with the 5k plan 😂🩷
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Love it

So easy to use

Developer apps

User experience

🐞

Reported Bugs

3 issues

App crashes or freezes during workouts

Bug

Inconsistent distance and time tracking

Bug

Syncing issues with Apple Watch

Bug
✨

Requested Features

4 requests

Option to view GPS route history

Feature

Ability to customize training days and schedule

Feature

Integration with more fitness tracking devices

Feature

Detailed performance metrics and analytics

Feature

FAQ

What is the Half Marathon 13.1 Trainer app?

This app provides a structured 14-week training program designed to help beginners complete a half marathon (13.1 miles or 21k). It utilizes a proven run-walk ratio to make training less grueling and reduce the risk of injury.

How does the run-walk method work?

The run-walk method involves alternating between periods of running and walking during your training sessions and the race itself. This approach helps manage fatigue, conserve energy, and build confidence for longer distances.

Is there a cost to use the app?

The app offers a free trial for the first week of training. After the trial, users can access additional features and content through an optional 'Zen Unlimited Pass' which offers subscription-based access to pro features across multiple running apps.

What devices is this app compatible with?

The app is compatible with iOS devices and integrates with the Health app. It is also featured on Fitbit and Samsung smartwatches, and offers iPad integration for indoor treadmills. The 'Zen Unlimited Pass' includes Apple Watch integration.

What are the main benefits of using this app for half marathon training?

The app's main benefits include a structured and easy-to-follow 14-week plan, audio coaching to guide your runs, the ability to map your runs, and access to a supportive community of other runners. The run-walk method is also beneficial for injury prevention and managing fatigue.