If you've ever watched a professional tennis match, there's a good chance you've heard the loud noises many players make while striking a ball. Research shows that these loud exertions tangibly increase an athlete's strength. So why don't players in other sports do the same? Pittsburgh Post-Gazette reporter Chris Huffaker takes a look.  

Find a full transcript of this episode here: https://newsinteractive.post-gazette.com/field-study-podcast/grunting-in-sports/