"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 ...

The key to an effective, pain-free crunch lies in the technique. It's not about mindlessly going up and down, but about engaging the right muscles and protecting your body. Here's a step-by-step guide ...

To get chiseled abs, you have to target your abdominal muscles at the front and fire up your obliques on the sides of your core. Oblique crunches are a simple yet effective exercise to add to your ...