From Longman Dictionary of Contemporary Englishcontortionistcon‧tor‧tion‧ist /kənˈtɔːʃənɪst $ -ɔːr-/ noun [countable] APBENDsomeone who twists their body into strange positions in order to entertain people
Examples from the Corpus
contortionist• Mitchell also said he did not anticipate contortionists having any specific problems with their bones as they age.• Marcel was a professional contortionist for decades.• I recently saw a circus act with contortionists folding themselves in amazing ways. 