Strengthen your core for the long haul.

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.

This article was reviewed by Craig Primack, MD, FACP, FAAP, FOMA. "Right to the core," "core values," and "hardcore." These little idioms highlight just how vital the concept of "core" is in our lives ...

Nick Blackmer is a librarian, fact-checker, and researcher with more than 20 years of experience in consumer-facing health and wellness content. Dead bugs improve core stability and coordination by ...