The natural order of classrooms has always been for children to sit. Whether it involves talking, discussion, working in groups or just listening to teachers, most of the time children do this from the comfort of a chair. On average, most primary school children spend 70% of their classroom time sitting down. Outside the classroom the number of children walking to school has decreased and, at the same time, many more children are now spending longer staring at screens. A 2015 study found that children aged 5 to 16 now spend an average of six and half hours a day in front of a screen. This is compared with around three hours in 1995.