I apologize for the previous suggestions not matching your description. Based on your updated information, here are some other suggestions for a Hindi song that closely match your initial description:
Song: "Le Gayi"
Movie: "Dil To Pagal Hai"
Singer: Asha Bhosle
Year: 1997
In the music video of this song, the male protagonist attends a dance class where he meets a group of girls. One of the girls teaches him how to dance, and there is a scene where another girl falls while walking on a tightrope.
Song: "Chand Sitare"
Movie: "Kaho Naa Pyaar Hai"
Singers: Kumar Sanu, Alka Yagnik
Year: 2000
In this song's music video, the male protagonist visits a dance academy where he meets a group of girls. One of the girls teaches him how to dance, and there are a few scenes where they are all practicing dance routines together.
Song: "Saathiya Tune Kya Kiya"
Movie: "Love"
Singers: S. P. Balasubrahmanyam, Chitra
Year: 1991
In this song's music video, the male protagonist joins a dance class where he meets a girl who helps him improve his dance moves. There is a scene where another girl falls while trying to walk on a balance beam.
I hope one of these suggestions is the song you are thinking of!
