I'm not really sure, but I think it's an exercise that was only held at two Olympic Summer Games, in 1952 and 1956.
It involved the entire team doing an exercise with a portable apparatus. It was very much alike with the rythmic gymnastics today. Below is a link to YouTube, that'll better show you what this is all about.
Hope it helped.
http://www.youtube.com/watch?v=TQhIo3Oq4h8
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