Add Yahoo as a preferred source to see more of our stories on Google. “As a fitness culture, and in society in general, we’re afraid of spinal flexion,” where the lower back is flexed into a C-shape, ...

But guess what? We've got some good news! There's a movement that's the perfect antidote: the so-called "back extensions." Don't picture a reverse push-up (that would be more like a bridge), but ...

"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 ...

Add Yahoo as a preferred source to see more of our stories on Google. Forget the crowded squat rack—trainers say the back extension machine might be the stealth weapon for building stronger glutes, ...