It was a serendipitous slip. When Alberto Perez forgot the music tape for an aerobics class that he was giving in his native Colombia six years ago, he had to improvise with the salsa and cumbia ...

This past weekend, I took my first Zumba class. For those of you who arent familiar with Zumba (or the silly infomercials it inspired), its a Latin-style calorie-burning dance/exercise class. As a ...