Focusing on one key area of your core could transform your strength and performance.

Why core matters: A strong core supports balance, posture, and injury prevention, while boosting performance in lifts and daily activities. Smart training principles: Progressive overload, resisting ...

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.