"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 ...

Forget the crowded squat rack—trainers say the back extension machine might be the stealth weapon for building stronger glutes, the powerhouse muscles that drive athletic performance and protect your ...

Forget the crowded squat rack—trainers say the back extension machine might be the stealth weapon for building stronger glutes, the powerhouse muscles that drive athletic performance and protect your ...