Jumping rope over the city ...
Adam Rifkin stashed this in Jump!
Ain't nobody got time for that.
More from the same set: http://imgur.com/a/Wzm5e
Apparently these pictures were taken for the 57th Shriners Convention in Chicago, in 1955.
The photographer was John Dominis, and as we can see, he and the acrobats were all batshit insane.
More information in the Reddit discussion:
So I guess this is what people did before the Internet.