What exercise to do in order to improve your health
18 July 2012 Last updated at 10:09 BST
A new study has suggested that a lack of exercise is now causing as many deaths as smoking across the world.
The authors of the report hope the findings will encourage people to do more exercise, in order to maintain a healthy lifestyle.
The BBC's Fergus Walsh explains what level of physical activity adults should look to maintain each week to help stay healthy.