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.