Subject: What is the simple demonstration that women have a lower center of gravity

I once learned a simple demonstration that women have a lower center of gravity 
than men, but I can't remember how it went. What I remember is backing up to a 
wall but don't remember what I did then? I know that girls could do whatever it 
was, but boys would lose their balance and fall over. Does anyone know what I'm 
trying to remember? 

Re: What is the simple demonstration that women have a lower center of gravity