Education Minnister Jan Björklund said that Sweden's move to cut back school sports during the nineties was "an unfortunate decision".
"Not only are we going to correct this, but we plan to improve it," he said on Wednesday.
He proposed that primary school students should be given 600 hours of excercise a year, up 20 percent from the current 500 hours.
"When students are on the move we know they're working better in class. Furthermore, there's been a change in lifestyle meaning children excerxise less these days."
The 100 hours will be taken from the students' free-choice subject time, meaning the move won't cost anything to implement. The National Agency for Education (Skolverket) has been tasked with determining how to structure student timetables in light of the increase.
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The change is planned to take effect in 2016.