Body Girls (1983)

Hyapatia Lee stars in this hardcore comedic feature as fitness instructor and health club owner Jackie La Lay, whose gym is about to compete against other institutions in a body-building contest. The men of one such rival club show up to make trouble, but Jackie sees it as the perfect opportunity for her gals to prep for competition, so she gets them to  engage the men in lots of muscle-building sex-ercise in all manner of positions. Joining Hyapatia in all this strenuous adult activity are fellow full nudies Erica Boyer, Robin Everett, Shanna McCullough, Tigr, Desiree Lane, and Lonnie Emerson. They even spot each other for a few reps of tongue calisthenics during some lesbian lovemaking with many an epic cooch closeup. Strap on your sweatbands, because this film will give your arm a real workout!