FILE - Cleveland Browns center JC Tretter (64) warms up before an NFL football game against the Los Angeles Chargers Sunday, Oct. 10, 2021, in Inglewood, Calif. Former Browns and Packers center JC Tretter announced his retirement Thursday, Aug. 25, 2022, after eight seasons in the NFL. Tretter, the current president of the NFL Players Association, only missed one game for Cleveland over the past five seasons despite battling injuries. He said on Twitter that he's decided “to stop playing when I wanted to — on my own terms.”(AP Photo/Kyusung Gong)