Under Armour's Armour39 built for intense exercise (pictures)
The $149.99 Under Armour Armour39 tracks serious workouts in terms of heart rate and exercise intensity.
Brian Bennett
Brian Bennett is a former senior writer for the home and outdoor section at CNET.
Gird it before battle
Consisting of a thick, rubbery chest strap and tracker "bug" unit, the Under Armour Armour39 is no casual fitness gadget.
Flat but wide
The Under Armour Armour39's strap is flat but as wide as ones you'll find on backpacks.
Over-the-top design
With yellow accents and gaudy paint job, the Under Armour Armour39 has a design aesthetic that's not for the timid.
Big, bold, but light
The Under Armour Armour39's strap is large but surprisingly light and comfortable to wear.
Replaceable, not rechargeable energy
The Armour39 bug tracker uses a watch battery that's replaceable, not rechargeable.
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