Crunch (exercise)

Common card · No. 302557

The crunch or curl-up is an abdominal exercise that works the rectus abdominis muscle. Crunches use the exerciser's own body weight to strengthen muscle and are recommended by some experts, despite negative research results, as a low-cost exercise that can be performed at home. Crunches are less effective than other exercises such as planks and carry risk of back injury.

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