When they filmed the movie ‘Van Helsing’ in Prague they needed one hundred couples who knew how to ballroom dance. Everyone thought this was going to be difficult to set up, but it turned out that literally every extra they hired could waltz. Back in Soviet days, the country didn’t have a lot of money for sports equipment, but every school had a record player. They taught the kids ballroom dancing for the Physical Education requirement.
My middle school made us learn to waltz in gym class. I’m ass at it, but it was fun.