"Hearst Magazines and Yahoo may earn commission or revenue on some items through the links below." If you've completed a core workout—or 100 of them—over the years, you likely know what crunches are ...

Our core is made up of four muscle groups that are essential to everyday movements, like walking and lifting. And when people think about core strengthening, crunches are often the first thing that ...

Ugh, crunches. Next to burpees, I'd say crunches are probably the exercise that most make me want to take a nap whenever an instructor suggests we do them in a workout class. And on top of being ...