#15 graphic is unique and soft enough for the clientele. Don't quite understand the grey "dot" in the graphic. Could it be changed not to have the dot?
#19 is nice. the graphic seems to embody the elegant, clean fitness concept. I like the graphic of a person. but not clear on how the blue "flame" of the graphic works into the logo.
#18 is kind of non-descript. i probably wouldn't go in this direction.