THE BOSTON GLOBE
The first marathon, in Novo, Antartica, was tough. The second and the third were the same. But by the fourth and fifth, Dave McGillivray’s fatigue was fading and his legs felt firmer beneath him. And in Miami, running his seventh marathon on seven continents in seven days, he felt so good the only thing stopping the 63-year-old from going for eight was that he’d run out of continents.