Prison Exercise

I thought that the Bollywood version of Michael Jackson's "Thriller" was hilarious:

Then I saw "1,500 plus CPDRC inmates of the Cebu Provincial Detention and Rehabilitation Center, Cebu, Philippines at practice!" I almost spit out my spiral pasta.

I wonder who came up with the idea. Did the warden think, "Hey, if they're doing musicals they have less time to riot" ?

I'm also intensely curious about how they selected the inmate portraying the "girl." I'm imagining flyers in the prison cafeteria proclaiming, "Nominate your favorite prison bitch!"