"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 ...

A simple yet powerful movement widely recommended by U.S. trainers to target the lower abs, improve core stability, and ...

Stream 'Crunch: The Perfect Yoga Workout (2001)' and watch online. Discover streaming options, rental services, and purchase links for this movie on Moviefone. Watch at home and immerse yourself in ...