Reg fee. IMO.
I really don't see value in this domain. Development would probably be a waste of energy and nobody (in my neck of the woods at least) uses this term to describe a fitness/exercise ball. Good luck.
First, to the OP, nice name. Like the previous posters have said, at least the words are in the correct order. The fact that advertisers are using those words is key - you never know, somebody may be interested in acquiring the name.
I'd say $XX - low $XXX. Plurals are generally better when describing products, but it's still a decent pair of words.
Secondly, to
Microguy...I respect the fact that you're entitled to your opinion, and you've shared a few good ones here, but what's the deal with reg fee for this name? I notice you say that a lot, and while many of the names that get posted here aren't worth a whole lot, they're not ALL crap. I suppose it's difficult to "see the value" in a name if you can't put yourself in the shoes of the people for whom the term is relevant (i.e., the fitness industry).
Personally, I can't see how Brookfield.TV, which you posted on Ebay starting at $1, is more valuable than a name like this. One of the reasons I've stopped posting appraisals is because you're basically asking for feedback from a bunch of resellers who have limited (and specific) interests, not end-users, who are our targeted customers.
