This seems to me like a combination of muscle power and momentary levitation 
("losing" weight):
 

 https://www.youtube.com/watch?v=TfUX_w6XTw0&feature=youtu.be&t=15m 
https://www.youtube.com/watch?v=TfUX_w6XTw0&feature=youtu.be&t=15m

 

 YMMV, of course!
 

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