Here's a lost VHS that Jazzercise founder Judi Sheppard Missett probably wishes never made it to YouTube. The three ladies trim their waistlines while they sing "Move your Boogie Body" by the Bar-Kays completely a cappella. That's some interesting cardio!

Jazzercise founder Judy Sheppard Missett gets intense about her workout, bouncing her "boogie body" as shouts frantically in time. Jazz-handing and shrieking positive reinforcement like a manic banshee, she is terrifying and wonderful—a real-life Kristen Wiig character.