Goupon would be a good way for you to go. They have a large number of subscribers and you can get a lot of exposure this way. I was actualy their first ever fitness deal they ever offered, back in 2009. They only had 1,500 subscribers back then and I have to say, it was the best marketing idea I ever had. I got a lot of clients from that deal and I also got paid for it. It cost me nothing and I developed a great relationship with Groupon which has paid over many times for me.