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In the world of medicine and child development, there is a widely held and influential view that physical activity begins to decline at adolescence. Not so, according to a new report in the British Journal of Sports Medicine. It suggests that exercise levels decline long before children get into their teenage years. John J Reilly is professor of physical activity and public health Science at the University of Strathclyde in the UK. He told Dan Damon about the study. (Picture: Children running between cones on playing field Credit: Getty)