Today, American Olympic Marathon medalist Meb Keflezighi puts in 15 to 20 percent of his miles at his "comfortably hard" pace, according to his coach, Bob Larsen.

根据教练Bob Larsen，对于美国奥林匹克马拉松奖牌获得者Meb Keflezighi而言，现在，“舒适地费力”配速占周里程15-20%。

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Leading up to the Marathon, Meb used the Walkman W Series to stay motivated during grueling workouts with his favorite music.

ENGADGET: Sony unveils Meb Keflezighi Edition Walkman W Series, fills it with the marathoner's coaching wisdom

Beginning this September, runners, marathoners, and music fans will get to compete in Rock the Race with Meb, presented by Sony Walkman W Series.

ENGADGET: Sony unveils Meb Keflezighi Edition Walkman W Series, fills it with the marathoner's coaching wisdom

Sony also congratulates Meb Keflezighi, an American distance running hero, on taking 4th in the Olympic Marathon and securing a place among the most accomplished marathoners in history.

ENGADGET: Sony unveils Meb Keflezighi Edition Walkman W Series, fills it with the marathoner's coaching wisdom