Add Yahoo as a preferred source to see more of our stories on Google. Your favorite ab-building machine at the gym may be causing you more harm than good. That's right—we're talking about the torso ...

Even after three months at the Port Charlotte YMCA, Cara McCarthy hesitates at the torso-rotation machine. "I'm still figuring this one out," she said. "Adjust it and lean back, I'm thinking." ...

If you’re after six-pack abs, you’re in the right place. The core workouts below have been hand-picked by top trainers to help you build muscle and forge a rippled midsection with enough definition to ...