calisthenics vs lesson

calisthenics

noun
  • A system of such exercises. 

  • Gymnastic exercises under the participation of a (surface-wise) multitude of muscles and often minimal equipment (thus, usually bodyweight exercises) with a stress on stamina. 

lesson

noun
  • An exercise; a composition serving an educational purpose; a study. 

  • A learning task assigned to a student; homework. 

  • A severe lecture; reproof; rebuke; warning. 

  • A section of learning or teaching into which a wider learning content is divided. 

  • A section of the Bible or other religious text read as part of a divine service. 

  • Something learned or to be learned. 

  • Something that serves as a warning or encouragement. 

verb
  • To give a lesson to; to teach. 

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