Cross-training“I know I have to have my body prepared to handle the pounding of the marathon. You can’t ignore that. But I also have to stay healthy,” says Keflezighi, who has a history of injury. “I do my main run in the morning, but then for my second workout I often would rather be on the ElliptiGO than take the risk of a 30-minute run in the afternoon.”Keflezighi typically rides between 10 and 20 miles on his ElliptiGO, which is one of his sponsors. “I ride at a pretty good effort,” he says. “I wear my heart rate monitor just for fun. It’s usually around 117, 118,” compared at 118-122 for a typical easy run. On days when he runs twice, he rides the ElliptiGO around noon, a couple of hours after finishing his main run of the day. During his peak preparation for Boston, he rode the ElliptiGO most days in a 9-day cycle. Form, Mobility and Core Work“Every time I run I do something else in conjunction with that afterward, once my muscles are awake,” Keflezighi says. He does post-run form daily unless he’s done a long run. The drills are the basic technique exercises that exaggerate elements of the running stride, such as skipping and running with high knees. His drill routine takes less than 10 minutes.