NFL Commissioner Roger Goodell delivers the Department of Exercise and Sport Science's annual Carl Blyth Lecture at the University of North Carolina at Chapel Hill, N.C., Wednesday, March 6, 2013.(AP Photo/Gerry Broome)

Associated Press
NFL Commissioner Roger Goodell delivers the Department of Exercise and Sport Science's annual Carl Blyth Lecture at the University of North Carolina at Chapel Hill, N.C., Wednesday, March 6, 2013.(AP Photo/Gerry Broome)
NFL Commissioner Roger Goodell delivers the Department of Exercise and Sport Science's annual Carl Blyth Lecture at the University of North Carolina at Chapel Hill, N.C., Wednesday, March 6, 2013.(AP Photo/Gerry Broome)
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