The plank is mentioned toward the end: “In the past decade, every branch of the U.S. military has begun to phase out sit-ups and crunches from their required t

The plank is mentioned toward the end: “In the past decade, every branch of the U.S. military has begun to phase out sit-ups and crunches from their required testing and training regimens, or else they have made them optional, alongside more orthopedically sound maneuvers such as the plank.”