i used to go to Body Pump / Body Sculpting in Ritz Carlton. They have mexican instructor Eric, and rumanian instructor Simina. Both are very good.

They take non member for 35 QR per classes. Nowadays non-member only allow to book 24 hrs in advance, most of the time the class is full :-(. They might putting a new class next month, so more alternatives timing to go.

Go and give it a try.