Fitbit's new fitness trackers are all about personalization

Fitbit is updating two of its most popular fitness trackers.

The new waterproof Flex 2 and heart rate-tracking Charge 2 are available now up for preorder and will officially go on sale in the coming weeks.

With the Charge 2, Fitbit redesigned its Charge HR with a larger display that makes the tracker look and feel more like a fitness-focused smartwatch. It has the same heart rate monitoring capabilities and smartwatch-style notifications (for incoming calls and texts) as its predecessor, but the bigger display combined with the overall slimmer band make the tracker feel a lot less clunky.  Read more...