One thing that has worked for me is to have your current boot camp clients recruit for you. I offer discounts for every person they bring and even free camps if they bring enough participants.
Also I try encourage them to put a note on face book after class, just seeing their post keeps others interested and some inquire about the camp.
The other thing that has been successful is to always wear a t-shirt promoting your brand and have other wear the shirt, it is free advertising after the initial cost.
Lastly always be working on increasing your contact email list and stay in contact often.
Our bootcamp is total word of mouth and results…. usually by Facebook.
I am on the Chamber Of Commerce as an Ambassador, I write weekly fitness columns for Pinole Patch but neither have brought me bootcampers.
Give out T shirts with your name on it, put a magnetic sign on your car with your name on it,participate in local business expos/farmers markets, Weight Watchers? You could offer a referral deal which I have not done yet, I am on the fence about it because I think it can weaken the value attached to the program.
Print advertizing did nothing for me.