FILE - In this Feb. 7, 2012, file photo provided by Tacoma Public Schools, recently retired NFL quarterback Jon Kitna instructs algebra students at Lincoln High School in Tacoma, Wash. In recent interviews with 40 players _ 13 rookies, 17 active veterans and 10 former NFL players _ The Associated Press heard growing worry about the physical and emotional toll professional football takes. The 43-year old former NFL linebacker Junior Seau's suicide at his oceanfront home on May 2 resonated across the age groups, with more than half of each saying that particular event pushed them to ponder their future in the sport or the difficulties of adjusting to a new daily life after leaving the league. (AP Photo/Tacoma Public Schools, Casey Madison, File)