Hi there, Ruth!
Whether zumba is ok or is up to you to decide.
Here are some things for you to think about-
1. if you dont normally listen to nonjewish music then please dont start now!
2. all of your actions WILL affect your kids, whether they are alive now, or in the future. Do you want your dancing provocatively to hurt their souls?
3. in the world to come, will you be ashamed when they play the video of your life and you’re dancing that way?