Did lower back injuries drive the commandant’s decision on planks?Did lower back injuries drive the commandant’s decision on planks? A U.S. Marine Corps recruit with Company E, 2d Recruit Training Battalion, Recruit Training Regiment, performs planks aboard Marine Corps Recruit Depot San Diego, Calif., April 26, 2016. (Lance Cpl. Robert G. Gavaldon/Marine Corps) The top Marine’s decision to authorize planks on the Corps’ annual fitness test may have been born ou
