The Fitbit Flex has changed. The second version of the popular fitness tracker has one big advantage over its predecessor: it's waterproof. That means you can now take the Flex 2 swimming without worrying that it will be the end of your device. It's not just the pool in which the Flex 2 is now comfortable hanging out. Fitbit has been working on making its trackers a little more fashion-conscious, and the Flex 2 can now fit in a range of holders from the standard silicon fitness band to a more discreet bangle or pendant holder. It will also give you notifications when you get a call or text on your mobile phone.

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