balance beam vs fitness center

balance beam

noun
  • A gymnastics event using the balance beam apparatus. 

  • The horizontal member of any balance (scale,) usually carrying pans at each end, supported at its center by a fulcrum. 

  • A gymnastics apparatus, a narrow wooden rail used in artistic (athletic) gymnastics. 

fitness center

noun
  • A gym or fitness club. 

How often have the words balance beam and fitness center occurred in a corpus of books? (source: Google Ngram Viewer )