Sit-up (noun)

An exercise in which one lies on the back with the knees bent and the arms folded behind the head, then lifts the upper body while keeping the lower back on the ground.

Origin:

Compound of the verb 'to sit' and the noun 'up'.

Examples:

1. He did 100 sit-ups every morning as part of his fitness routine.
2. She struggled to do even one sit-up, but with time and practice, she was able to complete a full set.
3. The coach recommended adding sit-ups to his workout to strengthen his core muscles.
4. He felt a satisfying burn in his abdominal muscles after completing a series of sit-ups.
5. She improved her sit-up form by using a stability ball for added resistance.