Children Playing Finnish Baseball (IMAGE) University of Jyväskylä - Jyväskylän yliopisto Caption High levels of physical activity is connected to higher grades at school over two academic years. Credit University of Jyväskylä Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.