See sit up for more
sit-up
ˈsit-up
British English, sit‧up American English /ˈsɪtʌp/ noun [countable]

an exercise to make your stomach muscles strong, in which you sit up from a lying position, while keeping your feet on the floor ⇨ crunch:
Jerry says he does two hundred sit-ups a day.
ˈsit-up
British English, sit‧up American English /ˈsɪtʌp/ noun [countable]
an exercise to make your stomach muscles strong, in which you sit up from a lying position, while keeping your feet on the floor ⇨ crunch:
