sentences:  As before, the trainers worked with the 12-round rule, and based their strategies on the 36-minute distance, compared to the 45-minute distance.The notion of "going the distance" is featured prominently in the 1976 film "Rocky" in which Rocky Balboa and Apollo Creed fight 15 rounds for the World Heavyweight Championship.Rocky says, 
  
  Balboa (Sylvester Stallone) and Creed (Carl Weathers) nearly go the distance again in their rematch in 1979's "Rocky II", as do Rocky and Ivan Drago in their showdown in "Rocky IV".