flexing vs wrick

flexing

noun
  • The action of the verb flex; a bending of something, a tightening of the muscles. 

wrick

noun
  • A painful muscular spasm in the neck or back 

verb
  • To wrench; strain 

  • To twist; turn 

How often have the words flexing and wrick occurred in a corpus of books? (source: Google Ngram Viewer )