According to a Pilates pro, the proper form for crunches doesn't involve crunching up with your hands behind your head because it can lead to neck pain. If someone tells you to drop down and knock out ...

Plus, which move is more effective for strong abs.

Beth Skwarecki is Lifehacker’s Senior Health Editor, and holds certifications as a personal trainer and weightlifting coach. She has been writing about health for over 10 years. Crunches are the ...

"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 ...

Dr. Shields is a physical therapist with a background in English Literature and a passion for healthcare and education. She hopes to combine her clinical expertise with her love of writing, establish ...

Here's what the exercise is, which muscles it works and why crunches are so good for overall health.

Core training is an important component of any well-rounded fitness program. Yet, with so many exercises to choose from, you may wonder where to start when it comes to building a strong, developed ...