[gear54rus]

I don't think you can unrack a 180kg barbell with your head and just stand there like that as a 90kg male, much less untrained. That is a humongous amount of weight.

[bob1029]

Not your head. Your shoulders. As if you were going to do a barbell squat.

[somenameforme]

I definitely don't think this is the case. For somebody who hasn't trained - they're not holding 180kg on their shoulders. I think two big reasons would be that they're not going to have core strength/training to support it, and they wouldn't even have the traps to support the bar on their upper back, it'd dig into them and cause immense pain and probably just roll as well.