- The OFFICIAL C25K® (Couch to 5K) program with millions of success stories!
- Official partners and 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, The Verge, Lifehacker and many more!

"C25K is easy to use, as you would hope for a beginner app." - New York Times

"Daily programs that alternate between short bursts of walking and running until you're ready to go the distance." - Forbes

"One of the highest-rated health and fitness apps... A modest, realistic workout schedule." - Men's Fitness

Our community is our priority. Questions? Comments? Suggestions? See why our community has made us the #1 5K training app.

≈ Real-Life Inspirational Transformations ≈
- Over 150,000 Likes and 1500 Success Photos at
- Our community inspires one another (and inspires us!) everyday. Hear their amazing stories.

"In this last year I have lost 97 lbs, gotten off insulin and 9 other medications, completed the C25K running app and started the 10k app. Life is a blessing." - Diana

“I went from a size 16 to a size 7. I tell anyone I can about the app. because it was nothing short of a life changer.” - Amber

"I'm now down 50 pounds from when I began C25K in August. I've gone through the program 3 times increasing my speed by a half MPH each time." - Claire

C25K® is the easiest program to get beginners from couch potatoes to 5K distance runners in 8 weeks.

The proven C25K program was designed for inexperienced runners who are just starting. The plan's structure prevents new runners from giving up and challenges them to continue moving forward. C25K works because it starts with a mix of running and walking, gradually building up strength and stamina.

≈ Less is More ≈
◎ Easy to learn. Just press start!
◎ Ideal for first-time runners
◎ 30 minutes a day, 3 days a week, 8 weeks total. Millions have finished their first 5K. You will too!

≈ 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!
◉ Map your run at the end of your workout!
◉ Exclusive partners with MyFitnessPal!
◉ Light and dark modes
◉ Listen to your own favorite music and playlists while you train
◉ Convenient audio coach and alerts
◉ Integrated with Facebook, Twitter, and Instagram
◉ Convenient access to our forums with thousands of veterans and newcomers starting the app. Join the community and meet other runners!
◉ iPad integration for indoor treadmills

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

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
– Terms of Use & Privacy Policy:
– 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 4.8.10

◎ 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
4.7K Ratings

4.7K Ratings

LeopardWarrior ,

I actually enjoy running now

The app is easy to use. And it's like having a friend and coach by your side. The workouts are challenging yet achievable, so I want to keep using it. Because of this app I now enjoy running, and I appreciate it very much.

I can echo the sentiments of the other reviewers, that the app keeps asking you to write a review even if you already wrote one.

I don't think the makers of this app actually read these reviews (I think the reviews are more or less for the purchasers of the app), so I'm going to see if I can contact them about this. I hope everybody else does too, if they haven't already done so. I think the app is good, and it can be better if we just let 'em know what the issues are.

sarahs3108 ,

Very buggy with iPhone 7+ and Apple Watch

I got this to use with my 7 plus and my Apple Watch. First, it keeps prompting me to turn on motion and fitness settings every time I open it, even though I've checked and double checked that it is, in fact, turned on. The most annoying part, though, is that I don't get audible notifications in my headphones when the phone is locked and in my pocket. I have to have it unlocked to get them. I've made sure my phone is not set to silent. And even if I turn off the auto-lock, it still sleeps in my pocket because of the light sensors. I don't remember having this problem on my previous phone, or with previous versions of the app.

Worse is the Apple Watch app. They take a long time to sync, and , most notably, if the app is running on my Apple Watch and my phone is in my pocket (how I ideally wanted to use it), I get nothing. Not a vibration, a sound, anything. I have to constantly check the timer while I'm running. The best solution I've found is to run the app on my phone, lock it and put it in my pocket, but NOT run it on my Watch. I will get push notifications on the Watch saying to run or walk. I don't, however, get to see the timer without pulling out my phone or opening the app no the Watch, which defeats the purpose.

2 stars because it does what it should IF you are willing to hold your phone unlocked for your entire run. Needs improvements. I'll be looking into other options.

Developer Response ,

Hello Sarah,

Please update to version 4.7. Looks like this review hasn't been updated since 2017. We've made a ton of optimizations and even added new features! We're sure you'll love it. C25K is a labor of love, so we hope you find these additional features useful. Please take a moment to update this review if you enjoy it. Thank you! :)

aplinformo ,

There’s a lot missing

I liked the interval portion itself, but the basic app is useless for the watch. I bought the pro. My biggest complaint is that the app doesn’t provide enough info. You do the program three days a week. Ok, is that back to back, spread out, what is it? Are they saying you need a rest day in between? What if you do all three, then you don’t have to do anything the rest of the week? I’m being only slightly facetious here. Many people, myself included, won’t be able to read between the lines. I think they need to be a little more clear.
The other thing I didn’t like was under the fitness program in the pro app there remains advertisements for other fitness apps. That’s usually the reason I purchase the app instead of using the free app. Not to mention, they want you to add a music subscription even if you purchase the pro app. It looks Apple Music might be integrated where you can just use that instead, but I’m not certain.

Drop the advertising and add better explanations and this is a 5 star app, without a doubt.


Zen Labs LLC (CA)
152.6 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
  1. Zen Power Playlist 1 Month $4.99
  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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