PARIS: Health problems caused by a lack of daily physical exercise cost the world some $67.5 billion (61 billion euros) in 2013—more than many countries’ GDP, researchers said on Thursday. The total was divided between $53.8 billion in healthcare spending and $13.7 billion in lost productivity, according to a study published in The Lancet medical journal. The research relied on economic and population data from 142 countries, representing 93 percent of the world’s population, its authors said. But the figure was likely an underestimate as the data covered only five diseases—coronary heart disease, stroke, type-2 diabetes, breast cancer and colon cancer—at least the percentage attributable to physical inactivity. The paper was the first to estimate the monetary cost of the global “pandemic” of inactivity, and was part of a special series timed for release ahead of the Aug. 5 opening of the Rio Olympic Games.