In this Aug. 23, 2018, file photo, Dave McGillivray, race director of the Boston Marathon, runs past fans inside Fenway Park, as he commemorates the last leg of his 80-day run in 1978 to benefit the Jimmy Fund, before a baseball game in Boston. A few months later, McGillivray underwent triple bypass surgery after suffering chest discomfort and difficulty breathing while running. He is cautioning people thinking of running a marathon to talk with their doctors before hitting the road, especially if they have coronary artery disease or a family history of it. (AP Photo/Elise Amendola, File)
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