How do elite athletes keep calm on the big stage? Dr. Sanjay Gupta looks at the science behind keeping calm.
원문출처 : http://www.cnn.com/videos/sports/2016/08/12/managing-nerves-athletes-sports-olympics-world-cup-gupta-orig.cnn
원문출처 : http://www.cnn.com/videos/sports/2016/08/12/managing-nerves-athletes-sports-olympics-world-cup-gupta-orig.cnn