The two sentences that provide the best evidence to support the main idea of the paper are:
-
"One of the most visible educational campaigns has been launched by the National Football League (NFL); it is entitled 'Heads Up' and trains coaches and student athletes on techniques to avoid head injuries."
-
"In a 2010 study, American University found that close to 80 percent of high school athletes had reported injuries during their athletic careers; approximately 25 percent of these injuries were considered serious."