get started vs work up

get started

verb
  • to begin an activity 

  • to begin (an activity or event) 

  • to cause (someone) to start talking about something in length 

work up

verb
  • To develop. 

  • To raise; to excite; to stir up. 

  • To give (a patient) a general medical examination to assess health and fitness. 

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