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Android Apps > Health & Fitness > Half Marathon Trainer 13.1 21K
Half Marathon Trainer 13.1 21K icon

Half Marathon Trainer 13.1 21K

by Zen Labs Fitness · Health & Fitness · Free
On Google Play since March 2012 · Data updated 2026-11-05

Half Marathon Trainer 13.1 21K is made and published by Zen Labs Fitness. AppBrain is an independent app data site and isn't affiliated with Zen Labs Fitness. The app name, icon, screenshots and description belong to Zen Labs Fitness and are shown as published on Google Play.

AppBrain's verdict

EstablishedLoved by users
Rating on Google Play
4.62
898 ratings
Installs
59 thousand
Last updated
December 17, 2025
Ads
Contains ads
Size
95.7 MB

Half Marathon Trainer 13.1 21K has 59 thousand installs. Users love it: 4.6 stars from 898 ratings.

Official page on Google Play

User feedback

Ratings and reviews on Google Play

Comments on Half Marathon Trainer 13.1 21K for Android

★★★★★ E C · Jan 21, 2026
This is my go-to run training app. I use it every time I get back into running or race training. It's reliable and sets attainable goals.
★★★★★ Cesar Julian Castillo Cabrera · Nov 15, 2023
It's the perfect guy that if you want to train yourself to a half-marathon.
★★★★☆ Jennifer P · Aug 16, 2021
Ok. It is functional however the tracker tracks me different mileage and different routes when I run the exact same route day after day. I doubt that the actual mileage is correct, so I would not use it as a tracker for PR's by any means which sucks because runners want to know their times and mileage. I will look for a better ap.
★☆☆☆☆ Connor Ingersoll · Jan 12, 2022
I had previously bought this app while training for a half-marathon. Now I am starting a new training program, and it says I have to buy in on it again. No, thanks!
★☆☆☆☆ Jodie Nowakowski · Feb 3, 2022
I purchased this app a while ago, but now when I log in on my new phone, they want me to pay for a subscription.... I thought when you bought the app it was yours. Obviously not! I'm not going to pay a monthly/yearly subscription fee for something that I already paid for. Now I have to find a new app to use. This makes me very grumpy!

Google Play Rating history and histogram

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Store listing

By Zen Labs Fitness, from Google Play

“Based on a run/walk program, this is the best beginners Half Marathon Trainer!”

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Screenshots by Zen Labs Fitness, from the Google Play listing
Description by Zen Labs Fitness Written by the developer, not by AppBrain. Click to read.
■ 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, best suited for first-time half marathoners and those who are new to running. 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!

≈ 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 app will train you to complete a full 13.1 (26K) distance using a RUN/WALK strategy ★
=====================================================

This proven 14 week plan is designed for true beginner/novice runners who want to train for a half marathon, but have very little running experience. This run/walk program is perfect for newcomers, as the walk breaks help mentally break up the race into segments, so you can focus on one section at a time. These breaks help make the half/full marathon less grueling, as well as reduces the overall impact and risk of injury.

But don't think that just because walking is involved that your time will be slower, or that you're accomplishing less. Many veteran runners have posted personal best times after switching to this run walk method! By using a ratio of running and walking, you can manage your fatigue which gives you the muscle resource and mental confidence to handle the later parts of the race.

Slowly build strength and stamina, and the blend of walking and running together reduces the overall impact and risk of injury. By the end of the program, you will be READY for your 13.1 (21k) race!

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

★ 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
◉ 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 and distance stats
◉ Full access to C25K, 10K, 13.1, and 26.2 programs
◉ 4 apps for the price of 1!

★ Love this app? We have a complete suite of health and fitness apps that covers all your fitness needs.
7 Minute Workout - https://goo.gl/WQuX61
0-100 Pushups Trainer - https://goo.gl/IfCFCh

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

★ The Forums are a great place to ask all your fitness questions!
http://forums.zenlabsfitness.com

Questions/comments regarding the app? Please email us at contactus@zenlabsfitness.com, or visit us at www.zenlabsfitness.com.


Legal Disclaimer
This app and any information given by it or by Zen Labs LLC are for educational purposes only. They are not intended nor implied to be a substitute for professional medical advice. You should always consult your healthcare provider before beginning any fitness program.

Recent changes:
A bunch of new updates just in time for Summer! Lets smash some goals and reach new heights of health and happiness!

Proud partners with Google WearOS and Samsung to be the featured running trainer!
Official page on Google Play

Safety and technology

Found in the app by AppBrain
Ads
Contains ads
Price
Free
Libraries
70
App size
95.7 MB
Needs Android
6.0+
Content rating
Everyone

Technologies used by Half Marathon Trainer 13.1 21K

30 permissions · 70 libraries
Subscribe to see full permission and library details

Releases

Updates seen on Google Play
Version
96.03
Launched
March 2012
  • Dec 17, 2025UpdateVersion 96.03
  • Aug 13, 2025UpdateVersion 96.02
  • Jun 23, 2025Installs50,000+ installs
  • Nov 20, 2024UpdateVersion 96.00
  • Aug 30, 2024UpdateVersion 95.98
Show all changes Show fewer

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Installs

Tracked by AppBrain
Last 30 days
240
Play install range
50+ thousand
Launched
March 2012

Installs over time

Half Marathon Trainer 13.1 21K has been installed 59 thousand times. Over the past 30 days, it has been installed 240 times.

Rankings

Google Play top charts

Google Play Rankings for Half Marathon Trainer 13.1 21K

This app is not ranked

About the app and developer

About Half Marathon Trainer 13.1 21K

Half Marathon Trainer 13.1 21K is a health & fitness app developed by Zen Labs Fitness.

How many times has Half Marathon Trainer 13.1 21K been installed?

Half Marathon Trainer 13.1 21K has been installed 59 thousand times. In the last 30 days, the app was installed 240 times.

What is the rating of Half Marathon Trainer 13.1 21K?

Half Marathon Trainer 13.1 21K is rated 4.62 out of 5 stars, based on 900 ratings.

Is Half Marathon Trainer 13.1 21K free?

Half Marathon Trainer 13.1 21K is free. The app size is 95.69 MB. The latest version available is 96.03. The last update was on December 17, 2025.

What are the requirements for Half Marathon Trainer 13.1 21K?

Half Marathon Trainer 13.1 21K requires Android 6.0+ or higher. The app has a content rating of Everyone. The app has been available on Google Play since March 2012.

App Performance Report

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Developer information for Zen Labs Fitness

Zen Labs Fitness

contactus@zenlabsfitness.com

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Frequently asked questions about Half Marathon Trainer 13.1 21K

Is Half Marathon Trainer 13.1 21K free?

Yes. Half Marathon Trainer 13.1 21K is free on Google Play.

Is Half Marathon Trainer 13.1 21K still available?

Yes. Half Marathon Trainer 13.1 21K is on Google Play, and the last update we saw was on December 17, 2025.

Does Half Marathon Trainer 13.1 21K contain ads?

Yes. Google Play lists Half Marathon Trainer 13.1 21K as containing ads.

What Android version does Half Marathon Trainer 13.1 21K require?

Half Marathon Trainer 13.1 21K runs on Android 6.0 and higher.

How large is Half Marathon Trainer 13.1 21K?

Half Marathon Trainer 13.1 21K is 95.69 MB.

Is Half Marathon Trainer 13.1 21K suitable for children?

Google Play rates the content of Half Marathon Trainer 13.1 21K as suitable for everyone.

How many times has Half Marathon Trainer 13.1 21K been installed?

Google Play lists 50,000+ installs for Half Marathon Trainer 13.1 21K.

How do people rate Half Marathon Trainer 13.1 21K?

Half Marathon Trainer 13.1 21K scores 4.62 out of 5 stars, from 898 ratings on Google Play.

Who made Half Marathon Trainer 13.1 21K?

Half Marathon Trainer 13.1 21K was developed by Zen Labs Fitness. It is listed in the health & fitness category on Google Play.

What are the best alternatives to Half Marathon Trainer 13.1 21K?

People looking at Half Marathon Trainer 13.1 21K also look at these health & fitness apps: Half Marathon (21k / 13.1m), Couch 5k - Running App, 5K, Triathlon, Marathon Plans, Campus Coach Running & Trail, Nike Run Club - Running Coach.

Share Half Marathon Trainer 13.1 21K

Top new apps Today's trending apps Popular Health & Fitness Apps Apps other people are watching Price drops on Google Play
Half Marathon (21k / 13.1m) icon Half Marathon (21k / 13.1m)
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5K, Triathlon, Marathon Plans icon 5K, Triathlon, Marathon Plans
Campus Coach Running & Trail icon Campus Coach Running & Trail
Nike Run Club - Running Coach icon Nike Run Club - Running Coach
San Francisco Marathon Tracker icon San Francisco Marathon Tracker
Run With Hal icon Run With Hal
RunMotion Coach: Running Plan icon RunMotion Coach: Running Plan
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