I first saw “SEAL” at a twenty-four-hour relay race in San Diego. After several marathons, this was my first “ultra.” I was on a team of six ultra-marathoners who would each take turns running twenty-minute legs. The objective: Run more miles than every other team in twenty-four hours. There were teams registered from all over the country. You know, friends coming together to test themselves physically and mentally. SEAL, however, didn’t have a team. He didn’t have friends. He was running the entire race… himself.