Rocky
It’s no wonder that Sylvester Stallone’s breakout role spawned a franchise with five sequels. People love David vs. Goliath stories. When no-name, down-on-his-luck boxer Rocky Balboa (played by Stallone) goes up against a world heavyweight champion, he gave us an underdog we could root for. The music in the training montage became the gold standard for every training montage that followed.