the sport. when a running back legend says he wished he had never played the game, people take notice. bo jackson, a two-sport athlete, many know by bo knows. >> bo knows baseball. >> know nows something else. he told "usa today" if i knew then what i know now, i would have never played football. never. the only man to be an nfl probowler and major league baseball star added i wish i had known about all of those head injury, but no one knew that. the head injuries he refers to is the long-term effects of concussions that can lead to cte. cte has been linked to deaths of newmumerous former football players, both took their lives after trug ling with the disease. other former players have said

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