I once dated a 6'5 woman and she was sweet as can be. She did a lot of modeling and worked out nearly 6 times a week.
Here she is, incredibly toned and kept in shape. I just resembled a bruiser that did nothing but lift at that time.
I definitely would give her a try because I find their passion for the gym attractive. Hell, passion for anything positive is a good thing. But like a woman too heavy, I draw lines when their addiction is negatively impacting their health. An overweight woman (or one that may be of an average build flat out does not take care of herself) could have high blood pressure from too many cigarettes and too much Pepsi. Conversely, a woman into steroids and other unnatural/illicit drugs or unhealthy behaviors could be damaging herself irreparably if using/abusing them just to get a certain "look".
"He who is not courageous enough to take risks will accomplish nothing in life." - Muhammad Ali