Britt Hertz demonstrates a series of dangerous and highly advanced contortion moves that viewers should not attempt.

When you think of contortionists, images of circus performers (perhaps a la Cirque du Soleil) likely come to mind. The bending, twisting, and stretching seem impossible — and never fail to mesmerize.

Britt Hertz tests her flexibility by attempting the most advanced stretches used by professional contortionists.