Need help with funny weight lifting challenge

Hi all,

I need some help from experts. I've watched a funny video about lifting a bar stool from the ground up with one hand (by the legs of the stool).

I would like to know what kind of muscles are needed to succeed in this challenge. I've seen people with huge arms who cannot do it and I really wonder why that is.
The video is called Bar Stool Challenge and can be found on youtube ().


Help appreciated,
Thx!
Rich
 
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