Half Marathon Trainer 13.1 21K

Contains adsIn-app purchases
2.8
856 reviews
50K+
Downloads
Content rating
PEGI 3
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About this app

■ 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.

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★ This app will train you to complete a full 13.1 (26K) distance using a RUN/WALK strategy ★
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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 [email protected], 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.
Updated on
Aug 22, 2025

Data safety

Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
This app may share these data types with third parties
Location
This app may collect these data types
Location and Device or other IDs
Data is encrypted in transit
You can request that data be deleted

Ratings and reviews

2.8
850 reviews
Becky Addy
September 29, 2025
Constantly crashing and starting the run from the beginning. Won't play the music from the app and music from another app won't restart after the voice over kicks in. so frustrating I can't use it at all.
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Zen Labs Fitness
September 30, 2025
Hi, we sincerely apologize and would like to look further into this. As we don't have your email address, can you please write to us at [email protected] so that we can help you better. We look forward to your email.
Doc Siphon
August 30, 2025
I bought this app years ago. It was a great training aid. However, I got injured doing army stuff and stepped away from long-distance running. I recently re-installed it, and now it's requires a subscription.
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Zen Labs Fitness
August 30, 2025
Hello! I'm really sorry about this experience! We've added many new features to the app, but updated to a subscription model to provide the best value for our customers. Feel free to contact us at [email protected] and we will help you to renew the access to the pro feature.
A Google user
June 26, 2019
The app is great when it comes to tracking and your way to a marathon and the live voice that i hear through my headphones is a great feature. but i would love it if i could connect to Spotify. and i didnt like the fact that i could end my run before the given time unless i would like to loose my data. you can also not look back at your run, which sucks. and there is no visuell ui, that lets you know what you havr completed
13 people found this review helpful
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What’s new

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!