Why is it more difficult to perform a sit-up when the hands are clasped behind the head than when the arms are kept at the side?

Question

Quizplus · Accepted Answer

When the hands are clasped behind the head, the distance from the head to the hip joint is increased, resulting in a longer lever arm or resistance arm. This means that the torque or rotational force required to lift the head and shoulders off the ground is greater. Therefore, it is more difficult to perform a sit-up with hands clasped behind the head than when the arms are kept at the side.

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