Personalize your fitness journey and fast-track your results by using real-time effort feedback during your workouts. Track any activity, both indoors and in the gym, and see exactly how hard your body is working as you exercise.

-Effort based activity tracker
-Tracks pace, distance, steps, elevation, calories, etc.
-Post workouts, pictures, & statuses to the community feed
-Audio prompts for effort changes, time, distance, etc.
-Post-workout effort review with interactive graphs & maps
-Post-workout zones graph
-Effort-targeted challenges
-Streak count
-Nudge friends
-Badges & awards
-Workout comparison
-Daily effort-based leaderboards

Effort ranges on a scale of 0-100, with 0 meaning no effort and 100 meaning max effort. Wear a heart rate monitor for real-time effort feedback throughout your workout (optional but recommended). If you don’t have a HRM or Apple Watch you can log your workouts manually with effort estimation.

Effort looks different for everyone. If you’re a professional athlete, you might run an 8-minute mile with a low-moderate effort, whereas a beginner might reach max effort trying to get it under 10 minutes. Each person has different capabilities, different body types, and different fitness levels and your effort reflects this.

We get it, finding time to workout is hard enough but knowing what to do when you go to workout is even harder. It’s for that very reason that we’ve put together workout plans with effort target ranges for each exercise (available for purchase on our website).

Real-time effort is useful while you’re working out, but even more important is what you do with that information. Each week, you’ll receive personalized insights detailing stats from the previous week, giving you the tools you need to fine-tune your fitness goals and maximize your results.

Connect with friends, family, trainers, coaches and more. Share photos, ask questions, post statues, and give encouragement all in the community feed.

“I love this app because it holds me accountable- not just to workout, but to workout THAT much harder.”
“I love this app! It's like Facebook for exercising!”
“A must-have app... it motivates, it records and it pushes you to achieve a better workout. I use to just go thru the motions in my various workouts, but now, with this app, I push myself and get some real sweat going”
“Without PK I was 40 pounds heavier than today with lots of pain in my back.”
“I had MapMyRun and then went to Strava but now prefer PK fitness.”

Connect your apple watch for easy workout tracking without needing your phone nearby! See metrics throughout your workout like real-time effort as well as pace, distance, calories, and more.

PK Fitness easily integrates with Apple’s Health app and provides data such as heart rate, calories, steps, etc. for all your workouts.

PK Fitness is GDPR compliant. Note that GPS running in the background can decrease battery life.

PK supports Apple Watch and Bluetooth enabled heart rate monitors for accurate effort tracking in workouts. For a full list of compatible Bluetooth heart rate monitors, visit

What's New

Version 2.2.3

Welcome Challengers!
This build has a couple of small tweaks that will make your Challenge experience a little richer.

Ratings and Reviews

4.8 out of 5

43 Ratings

43 Ratings

Effort Wins!


The PK Fitness app changes the game in tracking your workouts. It's a revolutionary idea, yet it's so simple - what you put into your workout is what you'll get out of it. Instead of just tracking time, distance, or any other random stat, PK focuses on your max heart rate. You'll quickly find out if you're working hard enough or not. Try working out with a friend to see the leader, which is ranked by the most effort for the joint workout. We had our entire family use PK Fitness for the Bryan Clay Fit for Fall race and our kids loved the instant feedback, motivating them to try harder and to keep going! Whether you're a professional athlete or an absolute beginner, you'll love this app - the simplicity of its effort tracking formula will help you improve. I've used so many fitness apps, but none that really get to the heart of what will drive true fitness like PK does. It's now my primary fitness app and I'm challenged to improve my health and fitness. Definitely give it a try, I think you'll love it.

Awesome app!


I have been using PK for several months. It has quickly become my go-to fitness app. In fact, it's the only one I use now. It does everything the others do and more. It tracks me, maps me, times me, even adds pictures, but what I especially like is that it tells me how hard I am working. It tells me how much effort I am putting into each workout. I used to think I was working hard but when I started using PK I quickly found out that I was usually just "doggin" it. I wasn't putting much effort into my workouts. PK shows me my effort level throughout each workout and keeps a record of all my workouts. I can easily see if I am continuing to work hard or just "doggin" it. For me this works as a real incentive to constantly try and improve my effort level.
An added bonus with PK is that I can also use it to track my friends and workout partners who also use it. We can compare effort or just nudge those who aren't working hard.

Fantastic Workout Tracker


I really enjoy this app. It's easy to use with uncluttered interface and access to as much or as little additional stats as one wants to see.

I like the effort level calculation. I like the voice prompts. I like the ability to add comments to completed workouts. Most of all, I like stability. This app stays connected to my HR chest strap even during pull-ups; something even the native app for my strap sometimes struggles with.

I can't comment on accuracy, but I can say something about consistency. Having used a number of activity tracking devices (including wrist-based from Jawbone, Fitbit, and Withings, smart clothing from OMSignal, and now chest strap from Wahoo), the effort and calorie burn data this app gives me is very consistent with the better products I've used. And that's the most important thing, because accurate or not, you want to know that results are consistently within range short term and improving long term.


Bred Ventures Inc
69.4 MB
Health & Fitness
Requires iOS 11.0 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.
© 2017 Bred Ventures Inc


  • Family Sharing

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

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