Video: Mo Farah and Boris Johnson launch child exercise campaign Speaking at Lilian Baylis School in Kennington, south London, they gave their backing to a report that warns England faces an "epidemic of physical inactivity" unless the Government changes the nation's sporting infrastructure. The Move It report, written by the Young Foundation, found that while London 2012 provided a fantastic showcase for elite British sport, fewer people are taking part in physical activity. A separate study, Designed To Move, found that today's children are the first generation to have a life expectancy shorter than their parents, and that a nine-year-old today in the UK will be 50 per cent less active by the time they turn 15. Mo Farah said: "If you don't do a certain amount of exercise you could have five years less of your life. It important to think about that as a parent. Lilian Baylis is among nine schools taking part in a three-year programme to demonstrate some of the recommendations of the Move It and Designed To Move reports. 1,200 children between seven and 12 will take part in 12 hours of physical activity a week, including PE, after-school clubs and community sports sessions. PhD students at Guy's and St Thomas' Hospital will carry out a three-year project to assess the health outcomes.