Like situps, crunches help you build muscle . But unlike situps, they work only the abdominal muscles. This intense muscle isolation makes them a popular exercise for people trying to get six-pack abs. This also makes them ideal for strengthening your core, which includes your lower back muscles and obliques.
Read moreHow many crunches should I do a day?
How many crunches should an individual do every day? 10-12 repetitions and three sets of crunches will be good enough. In addition, you may do three sets of two or three variations to engage the other muscles in the stomach.
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