Ian Janssen, Queen's University (IMAGE) Queen's University Caption Dr. Ian Janssen leads a study confirming the benefits of sustained, rather than sporadic, physical activity in preventing childhood obesity. Credit Stephen Wild 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.