push-up vs sit-up

push-up

noun
  • An exercise done to improve upper body strength, performed by resting on one's toes and hands and pushing one's weight off the floor. 

  • A push-up bra. 

verb
  • To perform a push-up, or to lift oneself off the ground in a push-up-like manner. 

adj
  • Supporting the breasts to increase their apparent size. 

  • Designed to be worn rolled up. 

sit-up

noun
  • An exercise in which the abdominal muscles are contracted, bringing the torso of a person lying down to a more upright position. 

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