My Zumba origins are humble. I was initially drawn to the Z, as I like to call it, because I wanted to be more limber and nimble. Yes, I was impressed that this combination of Latin dance and cardio workout can cause you to lose 500 to 1,000 calories per sweat-soaked, hourlong session. But my stronger motivator was a desire to remedy my somewhat Frankensteinian corporeal stolidity. There are parts of my body that have not moved since 1965.