• Medical Journalism
• Medical Education

Physical inactivity ranks alongside smoking as a major contributor to the burden of noncommunicable disease worldwide. A quarter of the world's population are smokers but over a third are physically inactive. Smoking causes 5.1 million deaths a year but physical inactivity causes 5.3 million. Both have population attributable risks for noncommunicable diseases of around 9%. The 21 July 2012 issue of the Lancet is largely devoted to the harms of …