Where Do Crunches Work?

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.

What will 100 crunches a day do?

I'm often asked if doing situps or crunches will get people the toned six-pack abs they're looking for. Unfortunately, even if you do 100 crunches a day, you won't lose the fat from your belly. ... The only way you can lose fat from your belly is to lose fat from your entire body.

What muscles are worked out during crunches?

Dr. Laskowski: The abdominal crunch is one of the most common exercises used to train the abdominal muscles. The abdominal crunch targets the abdominal muscles, which are part of your core muscle group. The stronger your core muscles, the easier it is to do most physical activities and sports.