Second Effort is a 1968 sales training film starring Vince Lombardi, the Hall of Fame head coach of the Green Bay Packers. The film also featured veteran character actor Ron Masak and other members of the Green Bay Packers organization, including offensive lineman Jerry Kramer. It has been cited as a "classic" and as the best-selling training film of all time. The film is still in use in leadership and management courses.