A step too far? How fitness trackers can take over our lives

Apps and wearable devices are touted as a way to transform health. But are we too obsessed by the 'quantified self'?

Martin Lewis owns his obsessiveness about counting steps with something approaching pride.

"I've never done less than 10,000 steps in any day for the last three years," he says. "But to be honest, if I do just 10,000 steps, I'm never happy. My average is nearer 25,000. It's an obsession."

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