Promotion of physical activity is a priority for health agencies. We searched for reviews of physical activity interventions, published between 2000 and 2011, and identified effective, promising, or emerging interventions from around the world. The informational approaches of community-wide and mass media campaigns, and short physical activity messages targeting key community sites are recommended.

Physical inactivity is an important contributor to non-communicable diseases in countries of high income, and increasingly so in those of low and middle income. Understanding why people are physically active or inactive contributes to evidence-based planning of public health interventions, because effective programmes will target factors known to cause inactivity. Research into correlates (factors associated with activity) or determinants (those with a causal relationship) has burgeoned in the past two decades, but has mostly focused on individual-level factors in high-income countries.

To implement effective non-communicable disease prevention programmes, policy makers need data for physical activity levels and trends. In this report, we describe physical activity levels worldwide with data for adults (15 years or older) from 122 countries and for adolescents (13—15-years-old) from 105 countries. Worldwide, 31·1% (95% CI 30·9—31·2) of adults are physically inactive, with proportions ranging from 17·0% (16·8—17·2) in southeast Asia to about 43% in the Americas and the eastern Mediterranean.

The teeming millions on foot and pedal are powering mobility in Indian cities. Their numbers exceed those who use cars. Yet they are victims of policy neglect. The result is high number of road accidents. Improving public transport systems and road design will encourage more people to walk and cycle. But are cities prepared to make this transition? There is a change of trend in certain pockets of India where communities are organising themselves to assert their right to walk and cycle. These zero carbon emitters have checked the country’s pollution from soaring.