CircusOz do heaps of adult classes. i've enrolled to do aerial work because I really want my dancer figure back and thought if I did something like that it would give me more motiviation and push myself because to be any good at that sort of thing you must have good flexibility and strength.
I get bored at the gym so if I do things challenging it will motivate me more to get in there, because I know those weights and pump classes etc will help with trapeze and tissu.
Check out their website if you are interested! They have casual classes as well and stengthening classes.
And its in Port Melbourne, its so nice down there.