you should have mentioned a place where you live/want to attend aerobic classes.
I can only help you in Quatre-Bornes.
I wonderful teacher! Her name is Dominique Rault. She offers different classes, not only aerobics. Two times a week in the morning and otherwise nearly every evening on the week days. The place to go is in the very beginning of Palma. The fees are very fair as well.
Hope to have helped you!