 Your head, hands, arms, or elbows do not have to touch the ground.At the end of each repetition, the scorer will state the number of sit-ups you have correctly completed.A repetition will not count if you fail to reach the vertical position, fail to keep your fingers interlocked behind your head, arch or bow your back and raise your buttocks off the ground to raise your upper body, or let your knees exceed a 90-degree angle.