Definition of "sit-up" []

• A physical exercise in which one uses the abdominal muscles to raise the torso from a supine to a sitting position and then lies back down again without moving the legs. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "To rise from bed, when lying on your back, roll to your side and push from your forearm and hands to reach a sitting position to avoid rising using an old-fashioned sit-up motion."
• "I saw a woman doing strenuous sit-up exercises and I remarked that they looked difficult."
• "If you want to decorate your mobile phone, Strapya will sell you Kinnikuman and friends as straps, or even as USB sit-up devices."