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[Comment] Physical activity—time to take it seriously and regularly

In 1994, the epidemiologist Jerry Morris described physical activity as the “best buy” in public health.1 In 2012, The Lancet published its first Series on physical activity, which showed an estimated 5·3 million deaths per year are due to inactivity; the Series concluded that physical inactivity is as important a modifiable risk factor for chronic diseases as obesity and tobacco.2 Today, we publish our second Series, which provides an update of the field since 2012 and an analysis of the latest science of physical activity and health, with a strong focus on low-income and middle-income countries (LMICs).