New Fitbit Charge 2 and Flex 2 pack auto-tracking, move nudges, more

Fitbit has updates its two most popular fitness wearables, with the Charge 2 and Flex 2 adding features like auto-recognition of different exercise types, guided breathing, and Apple Watch style reminders to get up and move. Meanwhile, there's a new app with Fitbit Adventures pitting your exercise regime against a trek through Yosemite, while designer collaborations aim to make the …