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.

YOU MIGHT'VE HEARD just how good Pilates can be for your core. Now, you have a chance to give some of those moves a try without having to step into a studio. This session uses just three exercises to ...

Berry combines a plank with a leg lift for a move that touches on core strength and stability, and also works the glutes. "Plank holds are great not only for core work but to build that static ...