don't try this at home

Especially the part at around 2:40!

And Aikido practitioners may especially enjoy the footage between 1:15 and 1:35 . . .

Stick with it to the end of the clip and you will hear the answer to the question, "how do you do this?"

Even if you don't speak Czechoslovakian, I would recommend visiting the website of Honza Blaha and viewing the amazing photos and video clips.

Link to English translation (automated, but you can get the idea) here.