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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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