Here’s the deal with Zumba.
The document you get at the end of the Zumba workshop is not certification, it’s a license. So if you don’t have a group fitness certification you are not yet certified.
As far as when it expires. Here is how Zumba works. If you are a ZIN member you don’t have to worry about your license expiring. You will be paying $30 a month to use the Zumba name and to teach their classes.
If, however, you are not a ZIN member your license is only valid for a year then you have to get it renewed.