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The diet has quietly become the rage among ultra-endurance athletes and elite soldiers, and it's a surprisingly yummy way to fuel up.

One of the biggest names in fitness has preached for years that a neo-paleo combination of protein and fats is the ultimate performance diet. Lately, he’s been telling his followers that they can even relax on the dietary guidelines a bit—while getting outside to play more. Can it really be this simple?

There's no better way to get in shape than to prepare for a triathlon. Here's your guide to the ultimate first-time experience.

At an off-limits facility in the Philippines, multisport coach Brett Sutton treats humans like horses and isn't above the occasional screaming fit. Works for some people—including Chrissie Wellington, the reigning Hawaii Ironman titleholder—but his critics say he breaks more champions than he makes.