Opening the iTunes Store.If iTunes doesn't open, click the iTunes application icon in your Dock or on your Windows desktop.Progress Indicator
Opening the iBooks Store.If iBooks doesn't open, click the iBooks app in your Dock.Progress Indicator

iTunes is the world's easiest way to organize and add to your digital media collection.

We are unable to find iTunes on your computer. To download the free app Armour39 by Under Armour Inc., get iTunes now.

Already have iTunes? Click I Have iTunes to open it now.

I Have iTunes Free Download
iTunes for Mac + PC


By Under Armour Inc.

Open iTunes to buy and download apps.


How strong is your WILLPower™? The Armour39™ app monitors your workout by tracking your heart rate, calorie burn, real-time intensity, and WILLpower™, Under Armour®'s unique measure that reflects overall workout difficulty in a single score. The Armour39™ app is compatible with any Bluetooth Smart Heart Rate monitor, although optimized for use with Under Armour®'s Armour39™ Strap and Module.

This app is compatible with iPhones 4S and later and optimized for 7.0.

What's New in Version 1.2

Optimized to support the release of iOS 7.0, this app addresses BTLE issues that have been introduced with the new iOS.

This app also introduces workout sharing through Facebook and Twitter, updates several minor graphical issues, and simplifies workout saving and deletion.

iPhone Screenshot

iPhone Screenshot 1
iPhone Screenshot 2
iPhone Screenshot 3
iPhone Screenshot 4
iPhone Screenshot 5

Customer Reviews

Location Setting

¡Would rate 5-Star...However,! Under Armour needs stronger app development to resolve the Location/GPS connectivity issue I am currently seeing...which is a constant connection with GPS when not using app. Granted, the intent is for backup in case of intermittent Bluetooth connectivity and consistency in provided GPS interface...when the app is actually up and running. My battery life has suffered on a daily basis and I'm forced to manually select preferred settings each time I prepare to record exercise. Love the app, the tech, and the feedback from my equipment; NOT so happy with the issue at hand. With that said, given if UA would update to resolve this minor problem...I highly recommend everyone on the face of the planet to get with the program and get this technology. Thank you to all, including Apple, UnderArmour/UA39, and developers at MapMyFitness! P.s. Don't forget to make life easy on everyone and help us out, I believe it to be a simple fix. Thanks again, your loyal consumer.

Revolutionary tool and a beautiful app!!!

The Armour39 itself is a revolutionary tool in the health & fitness industry! The WillPower score is quite effective at doing exactly what it's supposed to do.

As for the app itself, it is extremely user-friendly with beautiful animations and color.
I was really impressed with the fitness Assessment used to calibrate the A39 to your personal fitness level. It is extremely well done and easy to follow. This feature allows the A39 to "grow with you" and adapt your WillPower scoring to meet whatever your current fitness level is.
The app not only tracks your HR and WillPower in "real time" but is color coordinated letting you know if your in the proper training zone with just a quick glance!

I could not be more pleased with the A39 device. It's a high quality product and a STEAL at just $99. However, as mentioned in other reviews, Facebook sharing compatibility needs to be implemented. Personally, I'd like to see Instagram as well, but that's just MHO...

Great for tracking HR and calories

I'm training for a marathon and use the app to manage my HR so that it stays steady throughout my long runs and I don't wear out too soon. It's got large, color coded numbers so it's easy to track. Also, the monitor is really accurate so I get a better read on how many cals I burned than i do on a treadmill or other monitors I've used. When I run outside though I do use another running app at the same time to log my distance. No problems yet (10 long runs in!) with running both at the same time.

View In iTunes
  • Free
  • Category: Health & Fitness
  • Updated:
  • Version: 1.2
  • Size: 36.4 MB
  • Language: English
  • Seller:

Compatibility: Requires iOS 6.1 or later. Compatible with iPhone, iPad, and iPod touch. This app is optimized for iPhone 5.

Customer Ratings

Current Version:
All Versions: