I did it again... I forgot that when you leave this screen, it erases everything you've written. DOH!
I wrote you a lengthy response but, in short, my point was just that there are lots of guys who are much more attracted to women who are more interested in staying fit over doing their nails. I think you've just been hanging out with the wrong guys.
My wife works out as much as I do and I believe that a relationship works much better when you can share something like that rather it only being important to just one person.
Also, sounds like you're going to have to update your own self-image. If you are weight training and working out regularly, you very well may becoming "hot" in your own right!
Just please build on who you are and work from there and don't try to morph into one of those women who you THINK "all" the guys are after.
Q