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 ...

The good: Comfortable, Sleek design, Long battery life, Automatically tracks exercise, Swim-proof The bad: Lack of a screen limits its usefulness Who should buy: Swimmers; Those looking for an ...

Add Yahoo as a preferred source to see more of our stories on Google. The Flex 2 is a solid upgrade over the original, but it's worth spending a little more for a fitness tracker with a screen display ...