■ 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 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 13.1 (21k) program. Ideal for first-time half marathoners and those who are new to running. The program uses a blend of running and power walking to run-walk the entire half marathon.

See thousands of real success stories and race photos of your fellow runners using these running program at

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 beginner/novice runners. The run/walk breaks help make the half 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!

Listen to your favorite music while you train and follow the 13.1 program’s convenient audio alerts. Along with voice/audio alerts and music controls on your headset, just press “start”, put your device in your pocket, and you are ready to go. Alerts will tell you when to warm-up, walk, run, cooldown, and when minute is left to give it your all.

≈ Features ≈
◉ BRAND NEW MUSIC curated from top DJ's, built right into the app (subscription)! Scientifically proven to increase motivation by 35%
◉ Apple Watch and Health app integration
◉ Track your calories and distance for each workout! Tap the center dial to cycle through your stats!
◉ Proven 14 week half-marathon training program
◉ Listen to your own favorite music and playlist while you train
◉ Convenient audio coach and alerts
◉ Integrated with Facebook and Twitter communities. Meet other fellow marathoners and runners!

Questions/comments? Email us at or visit us at

≈ Connect ≈
Hashtag: #everymomentcounts

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

Zen Power Playlist auto-renewing subscription:

– Payment will be charged to iTunes Account
– Subscription automatically renews unless auto-renew is turned off at least 24-hours before the end of the current period
– Account will be charged for renewal within 24-hours prior to the end of the current period, and identify the cost of the renewal
– Subscriptions may be managed by the user and auto-renewal may be turned off by going to the user's Account Settings after purchase
– Privacy Policy & Terms of Use:
– Any unused portion of a free trial period, if offered, will be forfeited when the user purchases a subscription to that publication, where applicable

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

What’s New

Version 6.2.18

◎ 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.

Ratings and Reviews

4.7 out of 5
1.8K Ratings

1.8K Ratings

Tweaky510293 ,

Great for those trying to get back in the game

So I am 24 years old and have had two knee surgeries and for the last 5 years I have made every excuse to not have to try and get back to my previously athletic self. I have struggled mostly because of self esteem and every workout was difficult because it was mainly speed oriented and distanced. Needless to say the day after a workout I would be unable to walk. The nice thing about this workout is it is challenging but realistic and not painful to do. Granted I’m sore the next day but I can walk. I actually look forward to working out. I will post again when I have completed the entire training because I am registered for the Disney Princess Half Marathon in February so I am hoping to finish in a reasonable amount of time and I’m using this app as my training plan. I highly recommend it.

Laoghaire24 ,

First half or coming back from an injury? This is PERFECT!

First of all, read the description before buying this app. This isn't an app that trains you to run a half marathon the whole time. It trains you do walk/run at a consistent time and pace the entire time. Once you know that, go read the research about how interval training is the way of the future and even professional runners are doing it. It's not for the weak.

I'm coming back from a torn ACL and 2 surgeries so I need to take it slow and be smart. This app is amazing for exactly that. I hate having to time myself during interval training and the built-in instructions make it so I don't have to. Add in some workout jams and I've got a perfect training partner.

I usually give up on these apps after a few tries. But I'm still going strong and that Napa Valley half is looking closer every day!

HobbitMomRuns ,

Keeps Getting Better!!!

Love this app. I used Zen Labs C25K when I quit smoking, 10K Trainer to lose weight, and now I'm on the Half. This program is idiot proof and I actually look forward to the daily inspirations. It works beautifully with my playlists and I just won't run without it. Thanks for a constant awesome!!!


Zen Labs LLC (CA)
151.8 MB

Requires iOS 10.0 and watchOS 3.0 or later. Compatible with iPhone, iPad, and iPod touch.



Age Rating
This app may use your location even when it isn't open, which can decrease battery life.
In-App Purchases
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  2. Zen Power Playlist 3 Months $9.99
  3. Zen Power Playlist One Year $49.99


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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