- 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 beginning. 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%
◉ Track your calories and distance for each workout! Tap the center dial to cycle through your stats! (Pro version)
◉ 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
◉ Health app integration
◉ Integrated with Facebook, Twitter, and Instagram
◉ Convenient access to our forums with thousands of veterans and newcomers. Join the community and meet other runners!
◉ Free iPad integration for indoor treadmills

≈ Connect ≈
Facebook: @C25Kfree
Twitter: @C25Kfree
Instagram: @zenlabsfitness
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
– 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 5.0.10

◎ 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

4.8 out of 5
63K Ratings

63K Ratings

gopipsqueaky ,

Shhh...just trust the app

Ok so I have always hated running and running for even a minute straight was tough. I laughed when I saw some of the workouts through out the weeks on running 5 minutes straight? Several times a workout?? Hah! Well after reading the other reviews and people with similar background having success I gave it a try. It’s like the app puts a finger up to your lips and says “Shhh...just trust me.” You nod your head in silence and reluctantly jump on board. Some how, some way, you get through the workouts. Each week they get a little harder, but somehow you find yourself being able to sustain longer run times. You can’t believe it, it seems too good to be true. But you just don’t think about it and keep going. Because in the back of your mind you are afraid if you do think about it you’ll wake up and it won’t be true. Next thing you know you are running for the longest you’ve ever run in your life!! It’s a miracle! You feel great and your confidence is through the roof! Then it asks you if you want to start training for a 10k. And the panic and self doubt sets in all over. But it works!

Daalgrim ,

Back into shape and an active life

I used to be an avid runner- my Mile was down to 4:50 pace. As you get older, muscles and dynamics change especially if one does not keep up with fitness. I was trying to get back down to 6min but was going about it the wrong way with a slow jog and getting mileage in. It was frustrating and would take a lot of time just to run. I couldn’t keep at it because I also had this sore on the side of my knee. Come to find out I was going about my run all wrong because of my defeated mentality.
This app has changed all that. The mixture of walking and jogging encourages a faster pace and to kick up your knees. The reason; because it’s only 30 min- it’s like that carrot dangling to encourage one to run harder and correctly to build not only calve and thigh muscles, but also the glutes. I cannot emphasize enough on how this app encourages kicking up my knees and picking up my pace during the running portion, thus targets the correct muscles and taking pressure off my knees. Because of all those factors, I can remain consistent and actually look forward to it. I still don’t like running- but 30 min isn’t that long and is a nice escape either with music or talk radio. The best part- being active helps me keep up with my son when I’m playing with him. Just 30 min of my own three days a week- enables me to go the extra mile with my son after a difficult day at work.

gcrowland ,

Life changing app

I’m 46 years old and haven’t exercised regularly since high school. My philosophy about running has always been that it can’t be worth it because I’ve never seen a jogger with a smile on his face. But once I realized that I was 30 pounds overweight and was out of breath after just a few minutes of basketball with my 10 and 7 year old sons, I knew I had to make changes.

I saw this app and decided to give it a try. On my first day it was all I could muster to run for 60 seconds, but knowing I had 90 seconds of walking afterward gave me just what I needed to get through. That pattern continued each day as the app gradually ramped up my running time. Suddenly after three weeks I found that I was able to manage the work load with a bit more ease.

Encouraged, I thumbed through the next two weeks to see what was ahead. However, I forgot to thumb back to the day I was supposed to be on when my next run started, so suddenly I went from the end of week three to the beginning of week six. To my amazement, I was able to do it! So, I just kept going. This morning I ran 5K and felt exhausted but great afterwards. I have lost 20 pounds and have gone from barely able to run for 60 seconds to comfortably running for over 30 minutes. This app works! I doubt that I have a smile on my face while I’m jogging, but I sure do have one afterwards!


Zen Labs LLC (CA)
184.1 MB
Health & Fitness

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



Age Rating
Rated 4+
This app may use your location even when it isn't open, which can decrease battery life.
© Zen Labs Fitness
In-App Purchases
  1. Remove Ads $1.99
  2. Go To Pro $4.99
  3. Zen Power Playlist 1 Month $4.99


  • Family Sharing

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

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