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Hi Adam,
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?
Just a thought – hope you get your numbers 