Endurance Tests (IMAGE) University of the Basque Country Caption This is an elite Kenyan runner during an endurance test. Credit Jordan Santos-Concejero. UPV/EHU 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.