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Student uses twelve apps to monitor her every move

18 June 2013 Last updated at 16:14 BST

Are you one of those people who uses their smartphone to check things like how well you're sleeping, how far you're running, or how much you're drinking?

If so, you're part of a growing movement called "Quantified Self" - that's people using technology to analyse their lives.

A recent report found 150 million health apps have been downloaded so far - that's expected to reach 1.4 billion by 2017.

Sara M Watson is a Masters Student at the Oxford Internet Institute - she's currently using 12 apps to monitor her daily life.

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