Matt Fitzgerald is an endurance sports author, coach, and nutritionist. His latest book is Life Is a Marathon: A Memoir of Life and Endurance (Da Capo Lifelong, 2019).
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Some studies favor low intensity, some high intensity—read the fine print, and opt for both
The physiology behind that speed where you start breathing much faster and deeper—and its implications for your training
A relaxed, athletic balance is crucial to good running form. Here's why and how to improve yours.
The 12 most common, performance-defeating fitness mistakes, and how to fix them
Meet ϳԹ's Fittest (Real) Men in America. Emulation is encouraged.
Forget what you've heard about calories, pounds, carbs, or miles—the adventure athlete's real secret to optimal weight is all about energy management
ϳԹ races have come into their own. Time to join the self-punishing fun and tackle your first one.