Clare, I have to admit I never got that fit ;-) even I was going there for two years (happened to live close by). Anyway, completely depends on what you are looking for, the place at Flora is mediocre, you pay for what you get. If you want to bring a toddler (and have the money it takes) while working out maybe http://www.fitnessbbc.cz/vinohradska190 is your choice. There are loads of options, depending on what you want.