If you’ve ever tried them, you know side planks are challenging­—even more than regular planks. But they’re a critical move, says Keli Roberts, an exercise physiologist with the American College of ...

This no-movement exercise is one of the most reliable ways to measure core endurance, posture control, and spinal ...

YOU PROBABLY THINK you know how to do a plank. The ab training staple is relatively simple, after all—boiled down to the basics, all you need to do is get down on the ground and hold in place.

The fitness world has embraced a new champion in core training, and traditional sit-ups have taken a backseat. The plank, despite its deceivingly simple appearance, has captured worldwide attention ...