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 deserve a better ab workout than crunches. Strength training can help you build an athletic core. Equipment like a slam ball or medicine balls provides a more dynamic workout for gains. Stability ...

Your entire body depends on a strong core. It's the "control center," so to speak, providing stability and power to your upper and lower body. Your core also provides proper support to your spine to ...

Crunch test after 55 from MA, CSCS Jarrod Nobbe. Get score ranges, form cues, and tips to boost reps safely.

Core strength testing has come a long way from the straight-legged, twisting sit-ups used before World War II. We've moved on to bent-knee sit-ups, to crunches and now to the plank pose or hanging ...