Celebrity trainer Gunnar Peterson — yup, the one who trains the Kardashians, Kate Beckinsale, and the Los Angeles Lakers — wants to help you improve your core workout and make it as effective as ...

"Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." That's why it pays to dedicate focused training time on your core. You can start with these ab exercises ...

Exercises like push-ups, crunches, planks and Russian twists involve the hands, forearms, buttocks or the back touching the ground. But what if you don't want to sit or lie down or use your hands to ...