They're the mantras of all fitness classes, "Tighten those abs!" "Engage your core!" but do you actually know what muscles you're engaging? While "abs" and "core" tend to be used synonymously, the ...

"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 ...

It wasn’t so long ago that the most popular exercises in gyms around the world were ab crunches and sit-ups. That was simply because almost every man and woman joining the gym was chasing washboard ...