....but as long as she is healthy - that is all I care about.
Yes. I'm a runner myself and there are lots of amatuer level events here where I live. They're always good for people watching.
There's a big difference between skinny from youth and exercise vs. emaciated from starvation and drugs when you're older. It's easy to tell the difference even before the event starts. The latter involves loss of muscle mass, skin tone and all sorts of nasty things going on inside that you can't see.
It's not healthy for a man or a woman, but women seem to be subjected to an enormous amount of pressure to conform.