Fitbit upgraded its basic Flex band with water resistance for swim-tracking, but its step counts require manual tweaking to achieve accurate automatic exercise-tracking. The Flex 2’s headlining ...

“Fitbit Flex 2: The waterproof tracker is smaller, lighter, and better looking than the old Flex but it’s still got a few issues.” Swimming and automatic activity tracking requires extra steps to ...

The Fitbit Flex 2 is not for athletes or serious gym rats. For those who are casually interested in getting a bit fitter, though, the versatile design, great app and excellent auto-detect feature make ...