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"Have you ever thought about getting into running but don’t know where to start? Well, we have the perfect app for you. C25K by Zen Labs Fitness is an app designed for first-time runners."  - NewsWatch Television

Over 5 million people have lost weight, gained endurance and finished their first 5K runs with C25K® and Zen Labs Apps

Start using the free app on the Apple App Store and Google Play Store! Tailored towards first time runners! C25K® is the easiest program to get beginners from couch potatoes to 5K distance runners in 8 weeks.

success stories


I'm a childhood cancer survivor and have been an amputee for 21 years. The organization and set schedule of c25k really made the goal seem possible. Thanks for creating this app!


I used to be in a wheel chair and have undergone five major leg operations. I am now down over 100lbs. Your app helped me achieve something I've always wanted to do.


I started running at age 41. I'm down 5 lbs now and have lost many inches from my thighs and hips, without changing my diet. Thanks Zen Labs and the C25K Running Community!


I have eliminated all need for HBP and diabetic medicines in a short 8 weeks. I have never felt better and have undoubtedly added quality to my life. Thanks Zen Labs you guys rock.


In n 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.


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.


I'm now down 50 pounds when I began C25K in August. I’ve gone through the program 3 times increasing my speed by half mph each time.


I started C25K in an effort to drop some weight and get healthier. I finished C25K, have lost 40 pounds, and just participated in my first 5K race earlier today! What a feeling! It’s so amazing that I’ve made it this far.

Check out more incredible success stories from real people, just like you!

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