Your favorite ab-building machine at the gym may be causing you more harm than good. That's right—we're talking about the torso rotation machine. This is the Chubby Checker–inspired ab machine you sit ...

Shoulders down, back straight, abs tight, Fola Awosika instructed during a Foundations class at RowVigor in Arlington, the area’s first pop-up rowing studio. Then: “You want your legs to do the bulk ...

Instead of using a back extension machine, try using the 45-degree back extension machine. This piece of equipment helps angle your body as you stand in it with straight legs, allowing you to bend ...