"The Best" is not always the best. I'm looking for one where I don't need a membership to pay for all those days I don't have time to go to the gym.
In China the gyms had something like a 30day ticket, where one day was crossed off each time you visited. And this 30day ticket was valid for a year. Perfect, if you go 1 time this week, then 3 times next week and then are off for business trips for 2 weeks etc.
Anyway, those gyms in China were pretty basic - weights, lockers, showers and steam room, the best had an outdoor pool (not heated) that stayed open all year.