IMO (I am a right-now-born domainer, but a long time internet marketer) this is a good domain name for a real business.
First off; .com and .net are parked. Search engines do not like the parked domains as much as the real-content-websites (well, I have no parked domains, maybe I am wrong), with some real content (i think like 10-20 hours of work - that is not gonna kill you is it?) and links you will outrank them soon. The .org has no presentation.
What I would do in your shoes is that I would setup some nice wordpress theme on it and mix (lots of) youtube videos (there are bicepsillions of such vids) with some informative content, promote via fitness blogs and social bookmarking websites...
You have lots of earning possibilities. Affiliate sales, paid video programs, leads, whatever... in one year from now you could be earning 2-5k/month from that site.