Entry #2 is not bad. I like how you combine the figure into the C & F. However it is not pronounced enough and the "CF" gets lost in the bigger picture. Also, the color of the word "Fitness" gets lost when viewing this image. Maybe if it were darker or a different color that "pops".
I would prefer to see more of a three dimensional effect on the graphic like entry #3. However the extra "arm" on the graphic loses me altogether.
#9 the text is cool. the graphic is hard to distinguish. I can only see the "C" I would rather you choose between the "C" or use a clearer graphic of the "CF".