I have been working on a site in the exercise/gym/fitness niche and it's finally starting to rank. Right now I've only got Adsense on this site. I'm earning a little over $1.00 p/click and have about a 2.00% click-through-rate. I signed up with Neverblue a while back but never used it as I don't know much about CPA and I was wondering if I might be able to significantly boost my income by going with a CPA campaign vs. Adsense in this genre. Can someone shed some light on this subject? And if CPA is better, what types of CPA ads should I run?