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Fitbit Alta Activity & Sleep Tracker

$129.95
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Fitbit Charge HR Activity Tracker Wristband

$129.95 $119.95
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Fitbit Charge Wireless Activity & Sleep Tracker

$129.95 $108.85
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Fitbit Flex Wireless Activity and Sleep Tracker

$89.95 $78.95
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Fitbit Surge GPS Fitness Running / Activity Watch

$249.99 $248.95
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  • Black & Grey
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Garmin Forerunner 735XT GPS Running Multisport Watch

from $449.99
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Polar M400 GPS Fitness Watch & Activity Tracker

$229.95 from $149.99
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TomTom Spark 3 Music + Headphones

$149.99
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WeGo Relay Activity Monitor and Sleep Tracker

$59.95
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Yamax EX-510 Power-Walker Multi-Function Pedometer

$39.95 $29.95

All Fitbit trackers calculate active minutes using metabolic equivalents (METs). METs help measure the energy expenditure of various activities. Because they do so in a comparable way among persons of different weights, METs are widely used as indicators for exercise intensity. For example, a MET of 1 indicates a body at rest. Fitbit trackers estimate your MET value in any given minute by calculating the intensity of your activity.