edmee cherdieu dalexis has been teaching zumba for four years. she co-owns five zumba studios around new york city. >> what i wanted to bring to the new yorker was quality. the best of the best zumba classes they could take. >> reporter: so, what's it take to be a zumba instructor. the license costs $300 and its $30 a month for the music and the choreography. perlman says instructors are the secret sauce to success with more than 100,000 and counting. >> it's the business model of empowering people to participatç in your business. >> reporter: that relationship is a mutual moneymaker. >> it's only been two years and its only now that were almost breaking even but compared to where we started, which was zero to where we are now i feel confident that were going to stay in business and were going to keep on spreading it. >> reporter: and if you thought it's just a craze, experts say it gives participants a better workout than kickboxing, step and even pilates. ruben ramirez, nbr, new york >> susie: that's "nightly business report" for friday, januar