It’s good that Aaron has a gift for cadence, as it can make or break a quarterback.
“In football terms, simply put, a cadence means that a quarterback uses either a regular or irregular voice rhythm to communicate with his on-field offensive teammates,” AFCA Insider explains. “Quarterback cadence is one of the most important factors in maintaining momentum in an offensive system, and there are many ways for the quarterback to accomplish this task.”
Inside the Pylon, meanwhile, puts it this way:
“Cadence refers to all of the verbal signals delivered by the quarterback before the start of the play. Cadence is not to be confused with snap count, which is the signal for the football to be snapped by the center. The snap count is merely one component of the quarterback’s cadence. Teams use cadence to adjust protection, shift, motion, call audibles, make play calls and even identify the coverage, which ends with the snap count and the snap of the ball.”
Source : https://www.distractify.com/p/why-does-aaron-rodgers-always-say-319