There were fit women before. In Ancient Rome you have pictures of women lifting weights and that there were no fancy washing machines and any other contemporary equipment to ease work back then so women would be more physically active before. Somewhat moreso than most people realise especially when it comes to laundry and sometimes toilet flushing.
There’s no doubt that there’s growing female participation in every athletic activity as well as their historical counterparts, be it football (soccer) or weightlifting and sprinting. There were certainly female archers, swordswomen and polearms users especially in Japan. Bodybuilding’s an interesting example.
To be fair, one can observe similar changes in the selection of physiques in every sport like football, tennis and gymnastics especially with the latter selecting narrow-hipped shorter women. Bodybuilding’s another example starting with people who could pass for today’s fitness and bikini models.
Some early female bodybuilders would fit right in with contemporary bikini divisions but it’s inevitable that there’s a growing number of female bodybuilders with builds as we infamously recognise it to be.