This old-school move is often done wrong. Here's how to make the most of the exercise to help you build a strong lower half.

The back extension is a versatile exercise that can be performed virtually anywhere. It can be used as part of a training program to build strength or a rehabilitation program for injury recovery.

"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. And when it comes to choosing one, quality matters. We rolled up our sleeves and got to testing and researching the best back ...