Tsimane Man Chopping a Tree (IMAGE) University of California - Santa Barbara Caption A new study finds Tsimane men experience higher short-term testosterone spikes while chopping trees than they do playing competitive soccer. Credit Benjamin C. Trumble 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.