• Researchers found that 2.5 h/week (equivalent to 30 min daily of moderate intensity activity on 5 days a week) compared with no activity was associated with a reduction in mortality risk of 19%, while 7 h/week of moderate activity compared with no activity reduced the mortality risk by 24%. A smaller effect was found in studies that looked at walking alone.
• Researchers conclude that being physically active reduces the risk of all-cause mortality. The largest benefit was found from moving from no activity to low levels of activity, but even at high levels of activity benefits accrue from additional activity.

Woodcock, James, Franco, Oscar H, Orsini Nicola, and Roberts, Ian. “Non-vigorous physical activity and all-cause mortality: systematic review and meta-analysis of cohort studies.”International Journal of Epidemiology. (2010).