Starting in the Spring of 1992, the Fuji Television network aired an epoch-making educational program called “English Conversation and Exercise” [Eikaiwa Taisou] in which people combined English conversation and exercise! It was a mysterious program that seemed very serious and required hard work, but ended up evoking laughter. As the title says, the program brought together English conversation and exercise. In the beginning, with each movement, as the muscles were trained, they also remembered English conversation! The program was based on that concept. In the beginning, there were short situational plays, and then those scenes of English conversations stopped. Suddenly, the station’s exercise program introduced three “Zuiikin Gals” in leotards on the set, who cheerfully chanted and repeated English conversation in tempo while exercising. The program naturally brought together movement and English conversation to the body. By the way, the rectus femoris muscle was trained the first time.
Translation: Zuiikin English intro
A while ago, someone told me about some amusing videos from Japan that taught people English with the "Zuiikin Gals". The videos have ended up becoming popular because they seem so odd. Here's what the Fuji TV site says in the introduction (explanation) of that program: