FILE - In this March 1, 2018, file photo, Chris Borland, a former NFL linebacker and Big Ten Defensive Player of the Year at Wisconsin, testifies before the Illinois House Mental Health Committee hearing on House Bill 4341, which would ban tackle football for kids under 12 years of age, in Springfield, Ill. Borland was illustrating how repetitive sub-concussive hits that begin when children play impact sports can be as dangerous as a single hit that results in a concussion. Borland is raising money and awareness for the issue of veterans with traumatic brain injuries by taking part this week in "Pat's Run" on Saturday in Tempe, Ariz., alongside his brothers Joe and John. (Rich Saal/The State Journal-Register via AP, File)
The Associated Press
FILE - In this Nov. 16, 2014, file photo, San Francisco 49ers inside linebacker Chris Borland (50) runs back an interception as New York Giants' Odell Beckham (13) and Preston Parker (83) give chase during an NFL football game in East Rutherford, N.J. Borland knows firsthand all about the challenges of early retirement, having stepped away from a promising football career after one year because of concerns over head injuries. Borland spends his time now helping other football players and military veterans make that adjustment to their new lives that often lack the thrill and competitiveness of life in the armed forces or professional sports. (AP Photo/Bill Kostroun, File)
The Associated Press