To Boost Sports Performance, Grunt

FILE -- Maria Sharapova, an athlete who has been singled out in the past for her loud grunts, during a match against Anastasija Sevastova at the U.S. Open in New York, Sept. 3, 2017. A revelatory new study finds that yelling during sports could have greater benefits for performance than many of us might expect. (Ben Solomon/The New York Times)