# Half Marathon 13.1 Trainer — 21K Run Walk Training by C25K®

> Beginner half marathon training program with run-walk intervals and audio coaching. (iPhone/iPad app by Zen Labs.)

- Source: https://appshunter.io/ios/app/half-marathon-131-trainer/id514647091 (this page in markdown: same URL + `.md`)
- Developer: [Zen Labs](https://appshunter.io/developer/485971738)
- Category: Health & Fitness, Sports
- Price: Free with in-app purchases
- Rating: 4.70/5 from 5,572 App Store ratings · 181 written reviews indexed
- Age rating: 4+
- Requires: iOS 14.0 · 319 MB
- Languages: American English
- Released: 2012-04-19
- Data updated: 2026-08-28
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/half-marathon-131-trainer/id514647091/reviews.md

## What is Half Marathon 13.1 Trainer?

■ The Official Half Marathon Trainer App
■ Official partners and the ONLY C25K (Couch to 5K) app featured on FITBIT and SAMSUNG smart watches!
■ Featured on The New York Times, Los Angeles Times, The Washington Post, The Guardian, The Huffington Post, Men's Fitness, Forbes, Mashable, Glamour Magazine, Popsugar Fitness, CBS News, NBC News, Macworld, Cosmopolitan, Lifehacker, WebMD, and many more!

From the same makers of the #1 C25K® Trainer app, Half Marathon Trainer follows the same successful recipe to create an easy simple 13.1 (21k) program. Ideal for first-time beginners and those who are new to running a half marathon. The program uses a blend of running and power walking in training and racing. You’ll soon be able to run-walk the entire half marathon.

≈ Free Trial ≈
◉ Train the first week for free!
◉ Train to complete a full 13.1 (21k) half marathon using a RUN/WALK ratio

≈ Real-Life Inspirational Transformations ≈
◎ Over 175,000 Likes and 1500 Success Photos at facebook.com/c25kfree
◎ Our community inspires one another (and inspires us!) everyday. Hear some of their amazing stories.

This proven 14 week plan is designed for beginners. The run/walk breaks help make the full marathon less grueling and reduces the overall impact and risk of injury.

Don’t think that just because walking is involved that your time will be slower or that you'll be accomplishing less. Many veteran runners have posted personal best times after switching to this run walk method! Using a ratio of running and walking will better manage your fatigue and give you the muscle resource and mental confidence to handle the later parts of the race.

Turn on our award winning music and just press start! Our audio coach will guide you through your run! It's that easy!

≈ Less is More ≈
◎ Easy to learn. Just press start!
◎ Ideal for beginners.
◎ 14 weeks total.

≈ Features ≈
◉ Proven 14 week half marathon training run-walk program (1st week free)
◉ Convenient audio coach and alerts
◉ Map your run at the end of your workout!
◉ Light and dark modes
◉ Health app integration
◉ Free iPad integration for indoor treadmills
◉ Integrated with Facebook, Twitter, and Instagram
◉ Access to our forums with thousands of veterans and newcomers starting the app. Join the community and meet other runners!

≈ NEW Zen Unlimited Pass - Try it for free! ≈
◉ Award winning music curated from top DJ's!
◉ Scientifically proven to increase motivation by 35%
◉ Unlimited access to all pro features across ALL Zen Labs Fitness running apps
◉ Unlock calories, distance, Apple watch integration, and more
◉ Full access to C25K, 10K, 13.1, and 26.2 programs
◉ 4 apps for the price of 1! One subscription, multiple apps!

Questions/comments? Email us at contactus@zenlabsfitness.com or visit us at www.zenlabsfitness.com.

≈ Connect ≈
Facebook: @C25Kfree
Twitter: @C25Kfree
Instagram: @officialc25k
Hashtag: #C25K

Zen Labs is a proud supporter of the National Breast Cancer Coalition. breastcancerdeadline2020.org

Subscription pricing and terms:

The subscription will automatically renew unless turned off in your iTunes Account Settings at least 24 hours before current period ends. You can go to your iTunes Account settings to manage your subscription and turn off auto-renew. Your iTunes Account will be charged when the purchase is confirmed. If you subscribe before your free trial ends, the rest of your free trial period will be forfeited as soon as your purchase is confirmed.

Privacy Policy & Terms of Use:
https://www.zenlabsfitness.com/privacy-policy/

Apple Standard Terms of Use (EULA):
https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Legal Disclaimer

This app and any information given by it or by Zen Labs LLC are for educational purposes only. You should always consult your healthcare provider before beginning any fitness program.

C25K® is a registered trademark of Zen Labs LLC

## Key features

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

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| Zen Unlimited Pass Monthly | $4.99 | per month |
| Zen Unlimited Pass Annual | $74.99 | per year |
| Unlock Your Potential | $29.99 | per 3 months |
| Unlock Your Potential | $29.99 | per 3 months |

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Unlock Workout List | $0.99 | one-time |


## What do users think of Half Marathon 13.1 Trainer?

Overall sentiment: positive

**Pros**

- 👍 Easy to use
- 👍 Helpful for beginners
- 👍 Great for training and motivation
- 👍 Integrates well with Apple Watch and Fitness
- 👍 Customizable music playback

**Cons**

- 🐛 Occasional syncing and tracking issues
- 🔋 Drains battery life
- 💰 Subscription model change frustrates some users
- 💰 Paid app now requires subscription for full access

**Commonly reported bugs**

- App crashes or freezes during workouts
- Inconsistent distance and time tracking
- Syncing issues with Apple Watch

**Most requested features**

- Option to view GPS route history
- Ability to customize training days and schedule
- Integration with more fitness tracking devices
- Detailed performance metrics and analytics

## Recent user reviews (10 of 181)

All indexed reviews: https://appshunter.io/ios/app/half-marathon-131-trainer/id514647091/reviews.md

### 5/5 — Love it

*2026-08-08, version 6.5.30*

So easy to use

### 4/5 — Good program, but lacks appropriate reminders and cross training

*2026-07-31*

I appreciate the running break down. It has kept me running steady. Some days I run and later on I get a push notification asking me to lace up my shoes- no! I ran already. As for cross training- I would like to be able to click as complete as it sounds pretty funny in a cross training class to have get ready to run said out loud from the online trainer. There are some bugs to work out.

**Developer response:** Hi, we'd be happy to assist you further with this. Kindly email our support team at contactus@zenlabsfitness.com with all the details. Hopefully we can earn a higher rating.

### 5/5 — This app made me believe I can run!

*2026-07-16, version 6.5.30*

I had never believed I could run, now I walk and run confidently.  Thank you - the music helps too!

### 5/5 — Such a great training app

*2026-04-05, version 6.5.28*

Love the simple commentary and the clear plan.

### 5/5 — Great app

*2026-04-01, version 6.5.27*

Downloaded this years ago and I come back to it every time I fall out of shape. Easy to follow and good motivation.

### 4/5 — Great!

*2026-03-22, version 6.5.27*

I love the timer however my runs are not syncing and I am unable to connect to my watch

### 5/5 — Greatest training plan

*2026-03-03, version 6.5.27*

I started with the 5K trainer and have worked my way up to the 13.1. Ran my first half this past December and did it in 2:13. I recommend this for anyone wanting to get started

### 5/5 — Greatest training plan

*2026-02-20, version 6.5.27*

I started with the 5K trainer and have worked my way up to the 13.1. Ran my first half this past December and did it in 2:13. I recommend this for anyone wanting to get started

### 5/5 — Good motivation

*2026-01-08, version 6.5.26*

Sometimes you need a little motivation and this app does that. Alerts to workout. Pep while working out. And you can take pics when you finish. At the end you have a large collection to show you the hard work you’ve accomplished.

### 1/5 — Why is this a subscription?

*2025-11-29*

I remember paying for the running app library a few years ago. I could probably restore my purchase and get some lesser version of the paid subscription mess they’re pushing now, but I don’t want to support an app that refuses to let its backers own the software they think they’re paying for. The inability to permanently disable the flock of obnoxious tracking requests every time I start a workout is pushing me out of using this company’s apps entirely. I never thought Nike would have a better running app than Zen. I’m sad the company went this way.

**Developer response:** We apologize for any frustration you may have experienced with the change to a subscription model. We understand that this can be difficult, and we want to assure you that we made this decision with the best interests of our users in mind. We've added many new features, including music streaming, which we believe enhances the overall user experience. 

Please email us at contactus@zenlabsfitness.com with your original download date receipt, and we’ll certainly do our best to work with you and answer any questions you may have. Thank you for your understanding.

## Frequently asked questions about Half Marathon 13.1 Trainer

### 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.

## Version history (last 5 releases)

### 6.5.31 — 2026-08-24

◎ 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

### 6.5.30 — 2026-06-15

◎ 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

### 6.5.29 — 2026-06-15

◎ 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

### 6.5.28 — 2026-04-03

◎ 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

### 6.5.27 — 2026-02-19

◎ 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

## Apps similar to Half Marathon 13.1 Trainer

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [C25K® 5K Running Coach & Map](https://appshunter.io/ios/app/c25k-5k-running-coach-and-map/id485971733) | 4.8 (170,670) | Free | Health & Fitness |
| [Runna: Running Plans & Coach](https://appshunter.io/ios/app/runna-running-plans-and-coach/id1594204443) | 4.9 (33,417) | Free | Health & Fitness |
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| [Nike Run Club: Running Coach](https://appshunter.io/ios/app/nike-run-club-running-coach/id387771637) | 4.8 (417,410) | Free | Health & Fitness |
| [Running Walking Tracker Goals](https://appshunter.io/ios/app/running-walking-tracker-goals/id1136617388) | 4.8 (106,131) | Free | Health & Fitness |

## More apps by Zen Labs

- [C25K® 5K Running Coach & Map](https://appshunter.io/ios/app/c25k-5k-running-coach-and-map/id485971733)
- [10K Trainer by C25K®](https://appshunter.io/ios/app/10k-trainer-by-c25k/id511600311)
- [Marathon 26.2 Trainer by C25K®](https://appshunter.io/ios/app/marathon-262-trainer-by-c25k/id514662686)
- [Push Ups Trainer Challenge](https://appshunter.io/ios/app/push-ups-trainer-challenge/id690401205)
- [0-200 Situps Trainer Challenge](https://appshunter.io/ios/app/0-200-situps-trainer-challenge/id698136992)

All apps by Zen Labs: https://appshunter.io/developer/485971738

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-28.*