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WHAT DOES ARMOUR39™ MEASURE?
With Armour39™, athletes of all sports can measure,
track, and analyze the data that matters most. Armour39™
measures heart rate, calorie burn, real-time intensity and
WILLpower™, Under Armour®’s unique measure that
reflects overall workout difficulty in a single score.
HEART RATE
A highly responsive, precise
measurement of heart beats per minute.
CALORIES
An advanced algorithm that captures
calories burned with a high degree of
accuracy.
This real-time measurement captures
how hard an athlete is working by
measuring current heart rate as a
percentage of the athlete’s max heart
rate. It’s proof of how hard you’re
working relative to your peak ability.
INTENSITY
WILLPOWER™
The true measure of an athlete, it is a
single score that reflects overall workout
