Children taking part in a study to measure how much exercise they do fooled researchers by attaching their pedometers to their pet dogs.
About 200 children in east London were given pedometers to automatically count how many steps they walked and ran.
Mile End Centre for Sports and Exercise Medicine was surprised by the activity levels recorded in some obese children.
Professor Nicola Maffulli said: "Then we realised they were attaching the pedometers to their dogs' collars."
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