the act of twisting or deforming the shape of something (e.g., yourself)
<noun.act>
a tortuous and twisted shape or position
<noun.shape> they built a tree house in the tortuosities of its boughs the acrobat performed incredible contortions
Contortion \Con*tor"tion\ (k[o^]n*t[^o]"sh[u^]n), n. [L. contortio: cf. F. contorsion. See {Contort}, and cf. {Torsion}.] A twisting; a writhing; wry motion; a twist; as, the contortion of the muscles of the face. --Swift.
All the contortions of the sibyl, without the inspiration. --Burke.
Skills of contortion will come to the fore as writing - or heaven forbid, working on a portable - will challenge any theory of ergonomics.
He called the racketeering charges against him "a contortion of the law.