"Sit-ups" Natural Recordings by Native Speakers
A sit-up is an exercise in which a person lies on their back with their knees bent and feet flat on the floor, then lifts their torso to a seated position by moving their spine from a flexed position to a relatively straight position, using their abdominal muscles to lift their body. This is a common core strengthening exercise often used for fitness or rehabilitation purposes.
having a goal that is perpetually out of reach or impossible to achieve; characterized by relentless labor or a senseless struggle<br><br>(It comes from the myth of Sisyphus, who was cursed to roll a boulder up a hill, only for it to roll back down, requiring him to start again ad infinitum)