For those of you that welcome the collision between fitness and tech we're glad to give you some good news: the Fitbit Flex going on sale online and in John Lewis stores.

The calorie-checking, sleep-pattern dissecting activity monitor vibrates when you have achieved a goal - and allows you to check yourself out online, or, via the magic of Bluetooth, on your compatible phone.

It's available in black or 'slate' (dark grey) for £79.99, or you can pay out another £22.99 for teal, navy or tangerine. We're assuming the last one is going to be snapped up by Blackpool fans - the only other people on the planet to use tangerine as a colour description.

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