In an infinite universe, where everything's possible, there's
a gym somewhere that has reached its member capacity. All the equipment is being
utilised all the time, and the layout is such that members can switch between exercises
with minimum waiting and fuss. The only time that new members can join is when existing
members move out of the area (which they rarely do, as the club is so good), or
die (which they hardly ever do, as they're all so fit!)
Of course, there are plans to expand