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.
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.
Source: Wikipedia "Crunch (exercise)" · CC BY-SA 4.0
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