laboured vs stretching

laboured

adj
  • Expressive of strenuous effort. 

  • Of writing or speech or similar, stilted or not natural due to too much effort being used in the production. 

stretching

adj
  • Requiring a high level of effort or performance. 

noun
  • The act by which something is stretched. 

  • A form of physical exercise in which a specific skeletal muscle (or muscle group) is deliberately elongated to its fullest length in order to improve the muscle's felt elasticity and reaffirm comfortable muscle tone. 

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