"Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." And when it comes to choosing one, quality matters. We rolled up our sleeves and got to testing and ...

Back extensions are an exercise that helps strengthen your back and core. Here are several versions and tips for effectively performing them. Share on Pinterest A strong core isn’t just about the abs.

"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 ...