Joints and flexibility
I have been told by various people (some in the medical profession) that I have a great deal of flexibility in my hands and feet. I also have this odd habit of curling my toes under my feet when I am relaxing and it sometimes tends to freak some people out. But that is as far as my flexibility goes.
My knowledge of anatomy and physiology is very limited, yet, I wonder how the heck this woman can do those feats (such as sitting on one's head)?