Half Marathon 13.1 Trainer 4+

21K Run Walk Training by C25K‪®‬

Zen Labs

    • 4.7 • 4.8K Ratings
    • Free
    • Offers In-App Purchases


■ 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:

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 6.5.12

◎ 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

Ratings and Reviews

4.7 out of 5
4.8K Ratings

4.8K 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.

Jess76532 ,

Money for nothing

This app is unfortunately really disappointing! I am training for my first half marathon. I wanted an app to help me build a training schedule, give tips, and where I would be able to input all of my workout data. This app has no customization, and really offers practically nothing for your money. You can only track your designated daily workout, which is only running or cross-train, and you must have the app open while doing these in order for the workout to be documented. It only tracks time, not distance or anything else. There is no video, no suggestion, no tips, nothing. You CANNOT input your workouts manually, or add any data. I didn’t realize when I made the purchase that clicking on “Fitness plans” only takes you to all those sister apps that don’t exactly help either (who needs another music app)? Just really disappointed that I can’t get a realistic training schedule out of this. And I definitely do not enjoy having the app open with beeps and vibrations while I am trying to run or work out! Annoying app, no customization, take your money elsewhere!

Developer Response ,

Hi there! We are very sorry that you have experienced this and we'd like to make it up to you. Could you please contact us with the brief issue you have experienced via contactus@zenlabsfitness.com? Hope to hear from you soon!

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!

App Privacy

The developer, Zen Labs, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy.

Data Not Linked to You

The following data may be collected but it is not linked to your identity:

  • Location
  • Contact Info
  • Identifiers
  • Usage Data
  • Diagnostics

Privacy practices may vary, for example, based on the features you use or your age. Learn More


  • Family Sharing

    Some in‑app purchases, including subscriptions, may be shareable with your family group when Family Sharing is enabled.

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