In the first ten or twelve years of Jumbo useage several of the airlines had themed upper decks, Qantas was Captain Cook, Iran Air was a fantastic tea lounge with a beautiful Samavar(?) at the centre, Thai Air was an oriental lounge, they were extravagent and classy, but they were not economical. So with the advent of higher fuel prices, they filled those areas with seating and that's where we've been since. Even Gulf Air Tristars, known as Five Star Tristars, had a strange bar arrangement in the hold which one could only access by a service lift.
The gymnasium proposed for the new Airbus will only be a small arrange- ment in the hold.
Watch JAL, they used to put 550 in a standard 747.