Marine Corps Staff Sgt. Richie R. Salinas, center, a Force Fitness Instructor Course instructor, leads students Staff Sgt. Michael J. Hall, left, and Sgt. Chris Malacaso as they low-crawl through puddles at Camp Geiger, N.C., June 5, 2018. The course focuses on optimizing performance, increasing durability and maximizing readiness. Marine Corps photo by Lance Cpl. Isaiah Gomez