"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 ...

Add Yahoo as a preferred source to see more of our stories on Google. Our core is made up of four muscle groups that are essential to everyday movements, like walking and lifting. And when people ...

Welcome to Start TODAY. Sign up for our free Start TODAY newsletter to receive daily inspiration sent to your inbox — and join us on Instagram! Many people don’t use correct form when doing core ...

Planks are better at building core strength because they engage the deepest layer of your ab muscles. Crunches mainly target the surface abs—the “six-pack” muscles—and are better at improving ...

Our core muscles lie at the foundation of almost all movement we engage in. Whether we're getting out of bed in the morning or lugging groceries, a strong core can help maintain posture, balance, and ...

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 ...