USA TODAY | The US is one of the world's laziest countries — and it's making us fat USA TODAY Many Americans are downright lazy. And it's making us fat. That's among the findings of a study by Stanford University researchers using step-counters installed in most smartphones to track the walking activity of about 700,000 people in 46 countries … The Problem With Fitness Studies Based on Activity Apps Global study of 700K smartphone users shows link between obesity and activity inequality Walking Rates Are Key to a Country's Obesity Levels |
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