Changes to the exercises used for the military fitness testing are here to stay. It will take some time and practice to get used to replacing sit-ups and crunches with more static exercises like plank ...

Officer candidates perform push-ups during the Medal of Honor run at Officer Candidates School aboard Marine Corps Base Quantico, Virginia. (Marine Corps/Phuchung Nguyen) A major change to fitness ...

Planks strengthen your core, back, glutes, hamstrings, arms, and shoulders at the same time. They put less strain on your spine and hip flexors than crunches or situps. This article provides 15 plank ...