When Stan trains for the second ski race, a movie technique called "montage" is used. Usually backed by highly energetic music, featuring little or no dialogue, a montage shows the progression of a character from novice to pro, in short sequences. This has been used in many movies and TV series, especially in the 80s. Examples that are spoofed here are Karate Kid (I and II) and the Rocky movies.
Check out the lyrics to this montage's song in the "Quotes" section of this episode - it quite literally mocks the whole concept of a montage.