Australian children are among the least active in the world, ranking behind those in Britain and New Zealand, researchers say warning that the sports-mad nation was raising a ‘generation of couch potatoes’. A study released Wednesday showed that more than 80 percent of Australian children aged 5 to 17 failed to get the recommended 60 minutes of moderate physical activity a day, despite most playing a sport. ‘We do rank quite highly on organised sport participation and we are a sporting nation as we like to say,’ Natasha Schranz, a researcher from the University of South Australia, told AFP. ‘But this has clearly shown that it’s not enough because we still rank poorly for overall physical activity levels.’ The study, which compared data taken from 15,000 young Australians with that from 14 other countries, found that the most active youngsters overall were in Mozambique and New Zealand followed by Mexico.