I can say that around here in downtown-ish Bucharest the annual subscription for a popular gym varies between 500 to 800 euros per yer, depending on the chosen plan/options, but you really do want to get the more expensive plans/options that are between 700-800 euros. That is if you pay all in advance, if you pay month by month or 3-months by 3-months (it's all so complicated) the costs are between 80 to 100 euros per month.

I agree though that all this may vary. As a man you may choose to "cheapen out" a little and choose less expensive gyms that are located further out or who attract a different kind of clientele, but that option may not be available for many women (as my partner is), unfortunately.