U.S. Soldiers walk toward the rising sun during the 10-kilometer road march at the 2013 Army Reserve Best Warrior… https://www.rawpixel.com/image/3315439/free-photo-image-soldier-trauma-2-mile-runView licenseU.S. Army Sgt. 1st Class Desmond Burgess, an Army Reserve information technology professional assigned to the 200th Military… https://www.rawpixel.com/image/3319154/free-photo-image-pushup-exercise-running-copFree Image from public domain licenseParticipants in the 35th Annual Marine Corps Marathon (MCM) begin the 26.2-mile run Oct. 31, 2010, in Arlington, Va. The… https://www.rawpixel.com/image/8742281/photo-image-public-domain-peopleFree Image from public domain licenseU.S. Soldiers compete in the ruck march event at the 2018 U.S. Army Reserve Best Warrior Competition at Fort Bragg, North… https://www.rawpixel.com/image/8727801/photo-image-light-public-domain-personFree Image from public domain license