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From avoiding a "golden shower" to how much money—yes, money—to bring.

My friend always races triathlons in a red unitard because he says it’s his lucky outfit and wearing red makes him faster. I think he looks like a crazy malnourished Santa, but he always beats me. Can the color of my kit really affect my performance?

Can't run? Keep your legs moving in the pool and maintain fitness while you overcome injury.

My friend, an experienced marathoner, said I shouldn’t hang out at packet pick-up the day before my first marathon because being around the other runners will make me more nervous. Can other peoples’ pre-race jitters really rub off on me?

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Is "running everywhere" a feasible replacement for biking, cabs, and the subway? Noah Davis spent a week trying to find out.

Scott Jurek said he breathes through his nose while running easy because nasal breathing "lowers one's heart rate and helps brain activity." Should I be breathing out of my nose instead of my mouth when I exercise to improve my performance?

Noah Davis takes a look at Wade Barrett's transition from professional soccer player to semi-serious ultramarathoner

Check out Katie Arnold's author page.