Under Armour Armour39 Performance Monitor

Armour39® is the first-of-its-kind performance monitor that tracks heart rate, calories, real-time intensity, and WILLpower™—the first true measure of an athlete that boils your workout down to a single score 1.0-10.0. And, unlike other heart rate monitors that only average your heart rate data, Armour39® precisely captures every heartbeat no matter your workout—from endurance running to interval training. So now, you won’t just see yourself getting better...you’ll be keeping score.

Track your stats using the Armour39 app or watch. Armour39 now works with your favorite MapMyFitness® app so you can track these stats alongside distance, pace, and more.