aerobics vs warm-up

aerobics

noun
  • A form of exercise, designed to enhance one's cardiovascular fitness, normally performed to music. 

warm-up

noun
  • The act of exercising or stretching in preparation for strenuous activity 

  • Any act of preparation for a performance 

  • A period of time allocated for performing warm-ups. 

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