This no-movement exercise is one of the most reliable ways to measure core endurance, posture control, and spinal protection—making it a favorite among U.S. fitness professionals.

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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.

Core training after 50 deserves a more innovative approach. Your body responds better to focused tension, controlled movement, and positions that challenge stability in real-world patterns. Short ...