Etymology
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sit-up (n.)

also situp, kind of physical exercise, 1955, from the verbal phrase (attested from early 13c.); see sit (v.) + up (adv.). Related: Sit-ups.

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Definitions of sit-up

sit-up (n.)
a stomach exercise in which a person sits up from a supine position without using the arms for leverage;
From wordnet.princeton.edu