I was delighted when I heard the beep – it was only lunchtime, and according to my fitness tracker, I had already finished my exercise for the day. But, while I had taken 10,000 steps, I had barely broken a sweat.

Millions of people around the world today use fitness trackers to measure their daily activity. But while the devices are designed to help us improve our health, is there a danger that the captured data allows us to kid ourselves that incidental exercise is enough to stay fit?

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