define "healthy" or "fit" or "athletic"

I have a distinct picture in my mind of someone who fits these words.
Healthy/athletic bodyfat %, someone who can do alot of activities and keep
up with the pack, someone who eats healthy, etc.

I just recently started participating in my gym's cardio classes. Today I
did a Body Pump and was surprised to see the woman running the class was
more than a little chubby. But she was lifting heavier weights than anyone,
and she could bust a move. So, is she "healthy"? Obviously her bodyfat %
is probably much higher than the reccomended level. But in every other way,
she seemed fit.

So, it made me question, what is truly healthy? I'm guessing it's not a
single component (weight, bodyfat, etc). What do you think?