A swim-team member and student of Southwest Guilford High School does burpees during a Marine Corps workout at Southwest Guilford High School in Greensboro, N.C., Oct. 23, 2013. U.S. Marine Corps Sgt. Justin Lail, a recruiter with Recruiting Sub Station Greensboro and native of Catawba, N.C., has been working with the swim team for more than three weeks using Marine Corps physical fitness techniques to improve their overall conditioning for their upcoming season. (U.S. Marine Corps photo by Sgt. Dwight A. Henderson/Released) - A swim-team member and student of Southwest Guilford High School does burpees during a Marine Corps workout at Southwest Guilford High School in Greensboro, N.C., Oct. 23, 2013. U.S. Marine Corps Sgt. Justin Lail, a recruiter with Recruiting Sub Station Greensboro and native of Catawba, N.C., has been working with the swim team for more than three weeks using Marine Corps physical fitness techniques to improve their overall conditioning for their upcoming season. (U.S. Marine Corps photo by Sgt. Dwight A. Henderson/Released)