Every month Tokyo Metro releases a new poster to remind commuters to mind their subway manners. These posters have become quite well known (and often parodied) due to their simplistic art style and subtle humor. The same inconvenienced Japanese couple is also featured in every poster.

Who needs gym equipment? I always clear ample space in the center of the subway car so I can practice my Olympic rings routine.

In truth, what the guy in white is doing is quite popular with children, who often hang or swing from hand-grip to hand-grip like they are on a jungle gym.