Because Diego Luna was in Dirty Dancing: Havana Nights and the idea of Jyn and Cassian doing an angry Paso Doble is everything to me. I mean, for god's sake, Scott even yells at Fran that he's been in dance training since he was six years old!

Bonus points for:
+semi-retired dance teachers Chirrut and Baze who still take a turn in the over-40s now and then and put the kids to shame
++Bohdi Rook being an absolute beginner who worships Jyn's father, famed classical dancer Galen Erso (and Mads Mikkelson was genuinely a ballerino before he acted! I am not even making that up!!)