In July 1984, the famous author and runner Jim Fixx died of a heart attack while running. One 1 from his death: just because you run does not mean you are safe from heart problems. Thirty-five years later, Boston Marathon race director Dave McGillivray is 2 that message. "Being fit and being healthy aren't the same things," he says. McGillivray, a 3 runner, should know it. Six months ago, he had heart surgery after suffering chest pain and shortness of 4 while running. McGillivray's family had a long history of heart problems. "I honestly thought that 5 exercise, cholesterol-lowering (降固醇的) medicine, good sleep and the right diet, I'd be fine," he says. "But you can't run away from your 6."
Aerobic exercise (有氧运动) such as running, walking, 7 and swimming is known to reduce the risk of many health problems. But new research is questioning the value of "8exercise". In a study 9 in December, researchers in Spain found information suggesting that full marathons, 10 the famous Boston marathon, might injure the heart. Dr. Kevin Harris is a cardiologist (心脏病专家). He notes that running is a good activity, 11 the act of running "doesn't make you invincible (不可战胜的)". Harris adds that people who have a family history of heart problems should talk with their health care providers 12 running a marathon. " 13," he added, "men who are older than 40 and those people who have symptoms (症状) they're concerned about".
McGillivray says his doctor allowed him to race in the upcoming Boston Marathon. He has 14 in it every year for 47 years. "My new mission," he says, "is to create 15. If you feel something, do something...You might not get a second chance."
