Nature health boost (IMAGE) Stanford University Caption New research maps out how parks, lakes, trees and other urban green spaces boost physical activity and overall human wellbeing in cities. Credit Jacob Lund / Shutterstock Usage Restrictions Credit photographer, only use alongside this release 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.