Some people even specified "on the rings" but that wasn't necessary
Two people missed this: EricBess and Oversoul, so EricBess's lead is cut a bit. Everyone else got it: DarthFerret, Melkor, Mooseman, mythosx, Ransac, sageridder, TomB, and train
I googled it after I had guesses, so I knew I missed it. I figured they were manuevers in something, but apparently just guessed the wrong sport Still, I'm surprized so many people knew this one...
I have to thank my wife on this one. She watches so many stupid movies with gymnastics in them, that I was able to recognize this one right off the bat.
I had no idea about the other two, but like Ransac said, the Iron Cross was the give away and I was pretty sure it wasn't giving away military insignia.