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/ˈsɪt.ʌp/ · noun
An exercise in which the abdominal muscles are contracted, bringing the torso of a person lying down to a more upright position. The degree of difficulty can be controlled by choosing from partial-range or full-range versions..
Susan's doing sit-ups to strengthen her muscles.
Use sit-up when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Sit-up means An exercise in which the abdominal muscles are contracted, bringing the torso of a person lying down to a more upright position. The degree of difficulty can be controlled by choosing from partial-range or full-range versions..
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
Susan's doing sit-ups to strengthen her muscles.
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