Unfortunately I can’t commit either – but, had a look at your link and have to say I was surprised at how low the cost is… Was expecting to see a higher price tag – so, I don’t think (IMO) price is putting people off, which is a good thing
Not being in the fitness biz, not sure if this would work – but, could you contact your suppliers (of gym equipment etc) and see if they’d like to promote to their contacts? This could be good promotion for them if you were using any of their gear whilst over there and could talk them up a bit? Might get your message to people with fitness interest but not those you are already marketing too?
Hard to go past Gumtree for this type of thing. Free and easy to put up multiple ads too, each ad catering to a different market.Your also covering the entire country !! Will appeal to those who need the push and by going with you Bali, wont have the excuses not to do it.
Market it as “the start you need ” Your not looking for huge amounts of people, would be very surprised if this didnt work for you. Worth a go ??