Equilibrist n. One who balances himself in unnatural positions and hazardous movements; a balancer. "When the equilibrist balances a rod upon his finger."
... omnibus steps with her back to the horses. This keeps American visitors standing around looking for a mishap which never happens; for the Parisienne is an expert equilibrist and can perform this feat while the vehicle is at full speed, not only with safety but with an airy grace ... — Mlle. Fouchette - A Novel of French Life • Charles Theodore Murray