![Sports/Fitness: Fitbit Charge wristbands from $90, Fitbit One tracker $50 (Reg. $100), Folding Treadmill $1,200 (Reg. $1,500), more Sports/Fitness: Fitbit Charge wristbands from $90, Fitbit One tracker $50 (Reg. $100), Folding Treadmill $1,200 (Reg. $1,500), more](https://9to5toys.com/wp-content/uploads/sites/5/2015/11/fitbit-charge-sale-01.jpeg)
Sports/Fitness: Fitbit Charge wristbands from $90, Fitbit One tracker $50 (Reg. $100), Folding Treadmill $1,200 (Reg. $1,500), more
![A few quick thoughts on Fitbit's new activity trackers, GPS watch (with optical heart rate!) | DC Rainmaker A few quick thoughts on Fitbit's new activity trackers, GPS watch (with optical heart rate!) | DC Rainmaker](https://media.dcrainmaker.com/images/2014/10/Fitbit-New-Products-Image.png)
A few quick thoughts on Fitbit's new activity trackers, GPS watch (with optical heart rate!) | DC Rainmaker
![Fitness trackers aren't very accurate at measuring heart rate — and that can be dangerous - The Verge Fitness trackers aren't very accurate at measuring heart rate — and that can be dangerous - The Verge](https://cdn.vox-cdn.com/thumbor/9SFSNq_EQEEfMH5w8sWubWmjqc0=/0x0:2040x1360/1400x1400/filters:focal(1020x680:1021x681)/cdn3.vox-cdn.com/uploads/chorus_asset/file/2447680/DSCF5750.0.jpg)
Fitness trackers aren't very accurate at measuring heart rate — and that can be dangerous - The Verge
![Amazon.com: Fitbit Charge HR Wireless Activity Wristband (Black, Large (6.2 - 7.6 in)) : Sports & Outdoors Amazon.com: Fitbit Charge HR Wireless Activity Wristband (Black, Large (6.2 - 7.6 in)) : Sports & Outdoors](https://m.media-amazon.com/images/I/51wafNtYODL.jpg)