Cycling or walking to school increases a child’s ability to concentrate in the classroom, the results of a Danish study published Friday showed.

Children who were driven to school, or who took public transport, performed less well in a test measuring concentration levels, than those who had walked or cycled, a joint study by researchers at the universities in Copenhagen and Aarhus found.

“The exercise one uses to transport oneself to school is reflected in the level of concentration one has circa four hours later,” said Niels Egelund, a co-author of the report.

The results surprised the researchers, as their hypothesis originally focused on the effects of eating breakfast and lunch on pupils’ ability to concentrate.

“The results showed that having breakfast and lunch has an impact, but not very much compared to having exercised,” Egelund told AFP.