A traditional ab exercise, proper form is vital to getting the most from your crunches. While mostly performed by people seeking a six-pack, crunches also strengthen the obliques and the entire core. This can prevent injury when performing other exercises and in daily life.
Neck pain is the most common complaint with this exercise. Place your hands alongside the head, fingertips just behind the ears. Do not interlock your fingers behind the head, as this encourages you to use the arms to help pull your neck up. Tucking the chin toward the chest during the motion prevents excessive pressure on the neck.

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