i'm not sure about kidz can but what about a play group or even music classes? there's a music class at the chelsea heights comm centre that is only $5 & it goes for an hour & includes songs - singing, dancing, playing with instruments - and it's in a big hall so the kids can run about as much as they like (my DS spends more time running around than really listening to the music ). i know it's not strictly exercise but i still think it's stimulating & does involve dancing.

there's also some really good playgroups around our area (i'm in chelsea) that you could go to - less expensive than gymbaroo & lots of free play time & lots of equipment for them to use. then maybe your DS would enjoy something like the playball class at aspendale gardens comm centre when he gets to 2? i know a couple of people who go & who say their kids love it.

if you want any numbers/websites etc, just pm me