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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.

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Brian Bennett
Brian Bennett is a former senior writer for the home and outdoor section at CNET.
Brian Bennett
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1 of 5 Sarah Tew/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.
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2 of 5 Sarah Tew/CNET

Flat but wide

The Under Armour Armour39's strap is flat but as wide as ones you'll find on backpacks.
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3 of 5 Sarah Tew/CNET

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.
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4 of 5 Sarah Tew/CNET

Big, bold, but light

The Under Armour Armour39's strap is large but surprisingly light and comfortable to wear.
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5 of 5 Sarah Tew/CNET

Replaceable, not rechargeable energy

The Armour39 bug tracker uses a watch battery that's replaceable, not rechargeable.

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