■ Join the millions completing the Zen Challenge Series!
■ 0 to 200 Situps in 8 weeks!
■ Featured on Glamour Magazine, Yahoo!’s Appolicious, Popsugar Fitness, Apple’s “What’s Hot”, Apple’s “New & Noteworthy”, and doctor recommended on healthTap!

"I've tried tons of different ab workouts, but this one was my favorite. It starts out easy to give you the confidence you need to keep going. Started only being able to do about 20 situps and week 2 is already 25, but the program breaks it into smaller sets and gives you rest breaks to build your stamina gradually. I'm now at 50 situps!"

Are you ready for the 200 Situps Challenge? Train your body and build up to completing 200 situps with same people that brought you the OFFICIAL #1 5K Training app C25K®.

Using a proven program, you will be able to complete 200 situps after just 8 weeks! The Zen Challenge Series is tailored towards all fitness levels. From first-timers to fitness veterans, this app will build up your strength and stamina to complete 200 situps.

≈ It's easy and straight forward to start ≈
1. Just open the app and start!
2. Listen to the voice cues!

≈ Features ≈
◎ First 2 weeks are free! Get started today!
◎ Achieve badges and awards for finishing a workout!
◎ Intuitive user friendly interface
◎ Integrated with Facebook/Twitter/Instagram communities, so share your progress and achievements!

≈ NEW Zen Unlimited Pass - Try it for free! ≈
◉ Award winning music curated from top DJ's!
◉ Scientifically proven to increase motivation by 35%
◉ Unlimited access to all pro features across ALL Zen Labs Fitness apps

We hope you enjoy the app and find it to be a useful training tool. Please leave us any friendly feedback, and rate us if you like the app!

Questions/comments regarding the app? Please email us at or visit us at

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

Subscription pricing and terms:

The subscription will automatically renew unless turned off in your iTunes Account Settings at least 24 hours before current period ends. You can go to your iTunes Account settings to manage your subscription and turn off auto-renew. Your iTunes Account will be charged when the purchase is confirmed. If you subscribe before your free trial ends, the rest of your free trial period will be forfeited as soon as your purchase is confirmed.

Privacy Policy & Terms of Use:

Legal Disclaimer

This app and any information given by it or by Zen Labs Fitness are for educational purposes only. They are not intended nor implied to be a substitute for professional medical advice. You should always consult your healthcare provider before beginning any fitness program.

What’s New

Version 2.2.10

◎ New Zen Unlimited Pass!
◎ Unlimited access to all pro features across ALL Zen Labs Fitness apps
◎ Zen Power Playlist award winning music! Music tailored for exercise. Scientifically proven to increase motivation by 35%!
◎ Try the free trial today!

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
1.6K Ratings

1.6K Ratings

Nossacra ,

Zen Labs has got your back…err…abs!

Zen Labs has got your back…err…abs! Can't say enough great things about Zen Labs apps. I first bought C25K and loved it. No matter what you want to accomplish, the law of process rules the universe. Start small and work in increments to meet your goal. Love it…you will too!

keptore ,

Money Grabbers

I have been an avid user of this app for months, and have used it it was in early stages of release, and it's slowly gotten better over the years.

However, after paying to buy the app and completing 6 weeks of the course, I got on today to see that they sprung a subscription service in order to move on in the portion of the app I've gotten to. I've used money to USE the app and it HAD the functionality, but they locked it up until I pay money to use it again. I find this completely unfair and unreasonable to subject me to paying for a pass that I've already been working on for months prior to today.

I'm severely disappointed with how this was handled.

twoifiplay ,


You just locked me out of my push-up tracking to go to a subscription model. I already bought your whole bundle and now you want more money. You should really let folks who already paid keep what they paid for. Oh well, but while I am here here’s the review:

The app is fine for the $1 I paid. It makes it so you just show up and do what it says. But you can’t adjust the rest times or anything and spend a lot of time clicking through things. I was already considering switching to just tracking things myself anyways but I had spent $1 so I guess I stuck with it. Thanks for making that decision easier, I guess.


Zen Unlimited Pass Monthly
Music, stats, & pro features in all our apps!
Free Trial

App Privacy

The developer, Zen Labs, 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 Not Linked to You

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

  • Contact Info
  • 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.

More By This Developer

You May Also Like