Marshall Ulrich has run 129 ultra marathons and adventure races averaging 125 miles apiece. He started running in 1978, when he was 27, and tackled ultra marathons in his mid-30s. He once ran across the United States, from San Francisco to New York City, averaging almost 60 miles a day. He completed the Badwater 135-miler from Death Valley to the foot of California’s Mount Whitney a record 20 times, winning it four times, also a record.