A contortionist is someone who twists their body into strange and unnatural shapes and positions in order to entertain other people, for example in a circus.
contortionist in British English
(kənˈtɔːʃənɪst)
noun
1.
a performer who contorts his or her body for the entertainment of others
2.
a person who twists or warps meaning or thoughts
a verbal contortionist
Derived forms
contortionistic (conˌtortionˈistic)
adjective
contortionist in American English
(kənˈtɔrʃənɪst)
noun
a person, as a circus acrobat, who can contort his or her body into unnatural positions