Wow, a 2000 year old domain. Impressive.
I think it's okay, but many people go to health websites if they have health issues, not really if they're already healthy. Then, it could probably be a site talking about how someone stays healthy.
I'm not good with numbers, but healthonline.net sold for 1200 a couple of years ago.
FreeHealthyTips.com and ABetterHealthyBody.com sold more recently for around $100 each, but I'd say your name is better even though it's a .net.
The only extensions taken are .com, .net, and .info, though.
I'm going to try my first attempt with the x's like everyone else does. :D
Here goes...
low xxx but higher than $100.
What does everyone else say? Am I close?