Seeing as the job search is continuing to be unfruitful, I am considering a career change. I'm at the gym a lot.. I know a few things about lifting.. I like helping people, and I've taught fitness classes before, so I am entertaining the idea of doing the personal trainer thing.   Anyone here certified? If so, which certifications would you recommend (or not)? Pros/cons? Things I need to consider that I may not have thought of?