Kilian Jornet is one of the most awarded athletes I’ve ever spoken with. He’s also among the most laid back, shrugging and smiling when I ask him about his record-breaking feats. Though one assumes ...

Across the country, more people are lacing up their sneakers, whether it’s for neighborhood fun runs or full marathons. Just last year, the New York City Marathon saw more finishers than ever with ...

Perhaps you're deep in the midst of marathon training, or you're a beginner who wants to get better at running but are overwhelmed by anything longer than a 5k. Either way, it's time to give Jeffing, ...