I like where you are thinking in #43 with the arrow emphasizing the concept of going up. Past that, however, I'm not seeing much yet that would really look any different than 1000 other fitness company logo's. My aim is to try and find something a bit more distinct.
#58 is interesting. A couple of us quite like it, but the consensus is it needs something. We aren't sure what, though. Any chance you have any further ideas in that direction?