OK boys.....
Spiderworld - plenty of minor characters are muscular women, in fact, the protagonist travels to a city full of absurdly muscular and dimwitted humans kept as a heavy labour class living under the rule of controlled evolution. The muscular females actually play a central part of the plot too.
The Cradle - by Arthur C Clark and Gentry Lee - the apparent villian is a female bodybuilder; described as a very sweaty and sexualised one at that too.
Red mars, green mars, and blue mars - by Kim Stanley Robinson - references to ancient minoan culture, female athletes feature in numerous parts of the lengthy series.
The man in the high castle - by philip K Dick - one of the protagonists is a women who practices judo; described as tough looking and gained bodyweight from her martial arts exercices.
Foundation and earth (I think) by Isaac Asimov - (at least one of the latter foundation books) One of the explorers arriving on a human world is "arressted" by a very strong looking martial arts woman with authority. She forces him into a "rape" of sorts and her breasts are described along the lines of "just like the rest of her; large heavy and forcefull" or something like that.
Neuromancer, by william Gibson - Case's girlfriend is a seductive cyborg fighter called Molly
Dune series by Frank Herbert - the Bene Gesserit are a sort of amazon tribe/nation/significant force that plays a significant part in almost all the books.
The hot zone by richard preston - there is a female martial artist who took the lessons to make her moves more slow and composed but trained to the point "where she could kill a man". her body is not described as far as i can recall.