Core training has always been part of military PT and fitness testing. From crunches to sit-ups, flutter kicks, leg tucks and plank poses, the U.S. military uses many exercises to test core strength.

Maintaining a strong, stable core is among the most common fitness recommendations given to everyone from athletes to people with chronic pain. Terms like "core exercise" and "core activation" get a ...

It's tough to find a fitness test that can reveal your true strength in under two minutes, but this 90-second plank is one of them. While this plank test may look simple, it feels anything but. And ...