rehearsal vs warming up

rehearsal

noun
  • The practicing of something which is to be performed before an audience, usually to test or improve the interaction between several participating people, or to allow technical adjustments with respect to staging to be done. 

  • The act of rehearsing or contriving something; the fact of something's being rehearsed. 

  • A preparatory activity analogous to the rehearsal of a show. 

warming up

noun
  • a regime of gentle exercise undertaken before some strenuous exercise or sport 

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