I'm sure Lawrence has said all of this.
My main focus would be to clearly write down: 1. What sort of business do you want? Is it a small 1:1 facility or do you have aspirations to run a franchise model? Is it something in-between? Then 2: Create a target bullseye that fits your vision: Who do you want as your primary customers? Who would you like as customers - but are less fundamental to your business model? Who else do you think you could attract? Next: Figure out your USP. What makes you different to the 1000's of other gyms / facilities etc that are around. Finally... network... network... network to sell what you're offering (no matter how much you may dislike networking) BUT only in the areas where your target customer base sits. Give it some real pizzaz. If you "scatter bomb" your approach you will end up spending too much time and money on an audience that a) you don't want and b) aren't interested.
Hope some of this resonates and helps.