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 ...

The Army’s physical fitness test has remained unchanged for some 40 years: two minutes to do as many push-ups as possible, then two minutes for sit-ups, then a two mile run. Recruits need a certain ...

SIT-UPS are one of those exercises that refuse to die. They’ve been praised, blamed, cancelled, revived and still show up in boot camps, military tests, and random living room workouts everywhere. So ...