posture-master
/ˈpɒstʃəˌmɑːstə/ /ˈpɒstʃəˌmastə/noun
A master of the art of posturing; an expert in assuming unusual postures or attitudes of the body; especially an acrobat or contortionist. Also figurative. Now historical.
Origin
Late 17th century; earliest use found in Satyr against French. From posture + master.