Only one in eight youngsters is getting the recommended 60 minutes of physical activity a day, according to the British Heart Foundation (BHF). It surveyed more than 1,000 children aged eight to 15 in July and August. The survey found that a third of the children did less than an hour of exercise a week and 20% thought you only needed to do it if you were fat. Researchers say the lack of activity is starting at a younger age and energy- dense snacks compounding the problem. The BHF has launched a campaign aimed at obese 11-13 year olds.