My advice is, when you're just learning and trying to figure out the whole chorey/technique/teaching thing, don't focus soooo much on the entertainment aspect. We had a new instructor that was so into cracking jokes, etc., that she missed the whole big picture on Bodypump. Sure, it's great to be entertained, but not if it comes at the expense of the workout. I remember my trainer making a reference to baking a cake. You can't put the icing and decorations on without having the cake baked first. Add decorations as you become a better baker!
The person that invented lunges was evil, evil, evil!!!