Enhance your strength, endurance, and stamina, train for your 21k run with the best half marathon training app! 21K Run Trainer will help you become the runner you’ve always wanted to be! This is the easiest, most comprehensive and most successful half marathon training plan for you to train for your first 21K.

Our 12 week half marathon training plan will literally take you to the finish line of your first 21k run. 21K Run Trainer is a simple and powerful 1/2 marathon training app that will guide you through the whole journey with encouragement, useful tips, step- by- step interval planning, and so much more. Complete your half marathon by using the run/walk strategy and get the advice you need!

This half marathon training program starts off easy and slowly increases the runs. The real fascination of this 12 week half marathon training and running app is that it keeps you motivated and encouraged all the time. Keep your inner self in tune with your body by listening to audio coach guidance, read daily motivational quotes and enjoy great half marathon training plan!

Not only that you will get the motivation and information you need by using this incredible half marathon training program, but you will also be able to enjoy your favorite tracks while running and training! The running app features a built-in music player that lets you listen to your music during exercises. The audio coach gently blends in when needed, plus you get intuitive on-screen controls that make the experience even better.

Experience the pure enjoyment of running by having the best half marathon training app! If you need a half marathon training guide to reach your 21K goals easily, then 21K Run Trainer is exactly what you need. The app keeps track of your runs and achievements, it awards you with badges and gives you the opportunity to share your progress with your friends and family on any social media. Share your 12 weeks half marathon training log by Facebook, Twitter, or email, and don’t forget to invite your friends to join you!

- Reach your 21k run goals in 12 weeks
- Follow detailed half marathon training schedule
- Uses alternating walks & runs
- Audio coach to guide & motivate you
- Repeat workouts whenever you want
- Includes a music player to listen to music while exercising
- Built-in GPS & distance tracking
- Receive cool badges for your progress
- Tracks & logs each time you do a new run
- Share achievements with friends
- Fully customizable settings
- Supports both phone & tablet devices
- Smooth on-screen controls
- Integrated health kit for a workout track
- FREE to use half marathon training plan app

How to train for a half marathon and fully enjoy it?
It’s simple!

Get 21K Run Trainer for FREE today and just believe in yourself!

Please seek medical advice prior to commencement.

We currently offer two auto-renewing subscriptions with $0.99/week billed as a yearly $49.99 without a trail. & 7-day free trial thereafter weekly $1.49 billed as a six month $37.99.

By subscribing you get unlimited access and unlock all Training program, Transformation tracker, Diet recipes & 30 Day meal plan.

Subscriptions are set to automatically renew within the 24-hour period prior to the subscription end date. You can cancel your subscription at any moment in your iTunes account settings but refunds will not be provided for any unused portion of the terms.

App integrated with the Health kit, so you can find your activities data in the Health App.

Contact our client support via

Privacy Policy: and Terms of Service:

What’s New

Version 1.8

Hey runner, It’s a big update! Fixed technical glitch happen while running & in-app purchase. Keep running. Follow us, share your experience, and let’s know what you feel about new update

Ratings and Reviews

4.4 out of 5
320 Ratings

320 Ratings

AMRausa ,

Not so bad so far

I just started using this app. So far so good.

muh-gah-lee ,

Needs improvement

I only completed 1.5 workouts with the app. I didn’t like that even on the treadmill setting it did not record distance nor was there a way to edit the distance after having completed the workout. I could live with it and just write down my mileage in the comment nbd. However, my 2nd major red flag was during my second workout. I wanted to use my timer setting to do timed splits. After about 15 minutes of splits, I switched to this app which I assumed was continuing to run in the background but no time had passed. I continue toying with switch app to app. My treadmill and watch time said 35 minutes had elapsed, but this app said only 15 had elapsed (my warmup). Paused in the middle of the workout to delete and just rely on my watch.

add47 ,

Doesn’t track your workout

This app does not track distance and will randomly end the workout and restart it without warning so the log has multiple workouts for the same day with different times. It also doesn’t tell you when the workout ends. This app is in serious need of major updates. I did 2 workouts with it and the same problems occurred with both. I deleted it after the second workout.

App Privacy

The developer, Rumble, 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 Used to Track You

The following data may be used to track you across apps and websites owned by other companies:

  • Contact Info

Data Linked to You

The following data may be collected and linked to your identity:

  • Contact Info

Data Not Linked to You

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

  • Usage Data
  • Diagnostics

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


  • Family Sharing

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

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