I am a U.S. Marine Combatant Dive Course Instructor. I need to be in tear down the walls, crush your enemy and eat his bones shape. A Navy SEAL friend told me about CrossFit. During the first workout I thought my heart was going to explode. I’ve always had problems balancing the broad needs of a combatant diver. With CrossFit, I have improved my strength, endurance, and power simultaneously! — Staff Sergeant Mike Joyce, U.S. Marine Corps