I'm a licensed Zumba instructor (took Basic Steps Level 1 in August 2017, Basic Steps Level 2 July 2018), and stopped teaching last year. I keep my ZIN account, where I pay roughly $40 a month for music and choreography ideas, plus discounts off future trainings and merchandise. In my trainings I was never told that I was expected to sell Zumba merchandise on the side. I was just there to teach, and that is it.
The main reason I stopped teaching (even though I was mainly a sub) was because both my mind and body were bored teaching the same routines (with little variation between different songs of the same style), and I hated having to do mostly non-verbal cueing. I always looked like an idiotic traffic cop. LOL! It was also very hard to try to get new customers into the door. I tried to distinguish myself by throwing in other international rhythms. In my classes I would always throw in a Celtic/Irish routine, because I was obsessed with Riverdance when I was a little boy
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Plus, in each of the trainings I took (which were one day), there was a LOT of material thrown at you, which was overwhelming. I felt like I had to learn a lot on my own, which was hard.
Currently I'm working to get my AFAA Group Exercise Instructor certification (I'm planning to take the exam in June after purchasing the self-study course in February), and just got a job as a fitness instructor at the local community center (at the recommendation of the fitness director who saw me during a step class).