A contortionist is an ACROBAT who performs physical feats of extreme flexibility. They are able to twist and tie their bodies into seemingly impossible positions, such as tying themselves in a knot or forming a human pretzel. Contortionists often perform in circuses, on stage, and in other entertainment venues. The term 'ACROBAT' is derived from the Greek words akros and batos, meaning 'HIGH' and 'WALK, ' respectively. The term 'tie the knot' is an idiom that means to get married. Finally, the term 'human pretzel' refers to a contortionist's ability to twist their body into a shape resembling a pretzel.