Why do nfl coaches cover their mouth when communicating during a game?

Answer 1

In Baseball, signs and signals are used and frequently stolen and used to obtain an advantage. It is understood and expected that the other team is actually observing and making every effort to "steal" the sign. There is a reason that pitchers cover their mouth when they talk to their catcher; there is a reason signs are immediately changed when a player is traded to the opponent; there is a reason that catcher's mix up their signals when there is a runner on 2nd base. That is the culture of baseball and understood as a part of the game.

Source:thesportsfrappe.blogspot.com

Answer 2

They cover their mouth so that the opposing players cant read his lips, and figure out what they are talking about

It went from being a common sense strategy to standard practice for pitchers in 1989, during Game 1 of the National League Championship Series. Cubs catcher Joe Girardi went out to the mound to ask Greg Maddux how he wanted to pitch to Giants first baseman Will Clark. Clark saw Greg Maddux mouth the words "Fastball, high, inside", and he knocked the pitch literally out of the ballpark for a grand slam.

Answer 3

Coaches cover their mouths when calling plays so other teams cannot lip read what they are saying and determine what play was just called.