sit-up ( synonym found)
Definition of sit-up:

(n) : an exercise in which the abdominal muscles are contracted, bringing the torso of a person lying down to a more upright position
"susan's doing sit-ups to gain some muscles."
Definition of sit-up:

(n) : an exercise in which the abdominal muscles are contracted, bringing the torso of a person lying down to a more upright position
"susan's doing sit-ups to gain some muscles."
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