Differences between a crunch and a sit-up

Unlike the sit-up, when performing a crunch the lower back should not leave the floor. This is said to eliminate any involvement by the hip flexors, and make the crunch an effective isolation exercise for the abdominals. The difficulty of the crunch can be increased by lying on a declined bench and/or holding a weight on the chest or behind the head.

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Sit-Ups Defined

The sit-up is a strength training exercise commonly performed with the aim of strengthening the hip flexors and abdominal muscles. It begins with lying with the back on the floor, typically with the knees bent in an attempt to reduce stress on the back muscles and spine, and then elevating both the upper and lower vertebrae from the floor until everything superior to the buttocks is not touching the ground. Situps can be dangerous due to high compressive lumbar load and may be replaced with the crunch in exercise programs.

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