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.

Good core stability is important for everyday movements. You use your core muscles to keep you upright when sitting or standing, when walking or running and so much more. Core strength is important ...

Bed core exercises for seniors that rebuild strength after 60, with a CSCS trainer’s step-by-step form cues.