I like what you have done with the underlines. I would prefer to have the Fitness either green or black. Also I am changing the tag line to "keeping you on track"
Can you include any logo of a person doing fitness etc? even if a silouette or a stick type representation.
I like the idea - the arms with the z very clever - can you make less lines but still doe the effect right? maybe have the arms look a little less beefy too - I want to attract women to my business as well. It looks a little like smoke at first glance - I really like your idea though. Love the detail with the underlining and how the black becomes the tag line. Clever stuff.