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

 https://youtu.be/TfUX_w6XTw0?t=15m https://youtu.be/TfUX_w6XTw0?t=15m

 

 YMMV, of course! (Sorry for the wrong clip that I deleted)
 

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