"Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." THE BACK extension, that time-tested move for building back strength, has been around the block. But here ...

Ever wondered about that massive machine with a sliding barbell at the gym? Allow us to introduce you to the Smith machine. Despite being a staple in most gyms, this behemoth can be ...

LIFT WITH YOUR legs, not with your back. You probably recall this phrase almost any time you bend down to lift something heavy. It makes sense, too, since conventional wisdom holds that rounding your ...