The concept of Zumba came about by mistake, thanks to the quick thinking of a fitness inst ictor Beto Perez was about to teach an aer CS class in is hometown of Cali, Colombia, when r, 20 he realized he had forgotten his aerobics dance music. He only had one cassette tape with him which was full of Latin music. "l improvised," he said, "and that was the beginning of zumba." Instead of traditional dan classes where steps are counted es to beat zumba free-flowing and party-like proved popular with people who were fed up with working out, and Zumba moved from just another fitness fad to a true fitness phenomenon.