Genesis is offering 30 days free at the moment; I'm not 100% sure if that's on signing up or if it's a free trial though. (I've amended the deal to add the uncertainty about it, thanks to the …
14 day free gym trial. I haven't tried this out as I am not in NSW. This is different to http://www.ozbargain.com.au/node/2745 - the offer covers NSW and is only offered if you have not used a gym …