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Schools have been measuring kids’ fitness for decades, using now-controversial metrics like body mass index. California thinks there’s a better way.

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Scientists have already created a device that reduces the energy cost of running and predict mainstream applications within four years.

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It depends—but you can hold your breath longer in cold water

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She won Olympic gold in a sport that chose her. Can she do the same in the one she truly loves?

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The perfect summer day in this California beach town

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Forget about counting reps in your head. This clever jump rope uses embedded LEDs to project that number in front of you.

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American churches are building first-class gyms to get followers in shape and attract new members to the flock. Critics see lucrative businesses masked as ministries, but the programs are a spirited defense against our obesity epidemic.

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How endurance athlete Patrick Sweeney puts away nearly 3,000 calories a day on the ketone diet

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Two weeks of full-time, one-on-one instruction at Exos can set you back $4,800. Here’s how to get many of the same performance benefits without taking out a second mortgage.

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On-the-go fitness tools for athletes

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Goodbye crazy binges, hello almond butter?

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An expert look at the most feasible—and nuttiest—submissions

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A crude guideline for randy athletes

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A compelling case for ditching hill repeats

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Inside Specialized and Stanford University’s new alliance to research cycling’s effects on kids with ADHD

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The suit, filed after 28-year-old Avishek Sengupta drowned at the 2013 Tough Mudder Mid-Atlantic event, had major implications for the obstacle-course-racing industry

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The secret to unlocking your athletic potential is in your genes, but scientists don’t know what they’re telling us—yet

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And why they’re more susceptible to diet trends

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And when they'll be smashed—because half the fun of records is watching them fall

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Inside the revolution to reclaim city waterways for recreation

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Sorry, that wildly popular New York Times story is not for you

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Secrets to lasting focus and motivation

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A lawsuit reveals the personal spat that brought an end to the iconic endurance event

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It’s got nothing to do with sailing

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A new detergent called DeFUNKit promises to scrub stinky bacteria from synthetic workout apparel. We put the stuff to the test during a week of skiing, running, and traveling—and found we smelled as good on day seven as we did on day one.

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Why Aussie athletes often turn to supplements when living high

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More is not always better

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Or why you should never, ever stop training

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The somewhat simple answer to a popular question

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What you need to know to start competing in the ultimate chill winter sport

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Insider tips on conquering Aspen’s hottest event

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Essential race-day, gear, and training intel

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Champ Amby Burfoot and streak runner Ben Beach give the DL on the world’s most storied marathon

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Everything you need to know about ultrarunning's ultimate gateway drug

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Faves tweaked to optimize performance and recovery

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Unpacking the myths of winter fitness

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4 strategies to help you quit worrying and learn to love the snow

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The right moves make you faster and more resilient. Here's how to get the most important part of your training routine right.

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Outsmart three winter-specific risks before, during, and after your workout

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The new genetic tool has the potential to increase resistance to muscular injury or stress fractures—even produce stronger, faster athletes—but it's a puzzle that could take decades to solve

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The sport ends its most outrageous elements in a quest for longevity

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A new study brings up two more glaring reasons to avoid hitting the wall in training

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A new study explains why

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Inside the first ever Faith and Fitness Conference in New Orleans

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Four performances that prove it

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An effort by any other name won’t make you as great

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Turns out the navigation devices routinely overestimate distance traveled. Why that quirk hasn't—and won't—affect cyclists.

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And how to put off being totally, utterly f*ed

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The spirit of long-distance triathlons is being swallowed by behemoths like the World Triathlon Corporation. And it's our own fault.

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Researchers say there is indeed too much of a good thing, and it’s killing your athletic potential

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New research shows that while high-intensity movement is beneficial, nothing compares to the benefits of more movement

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Oxygen seeks to show the beauty of female athleticism—and that women can be kick-ass athletes for life

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Athletes competing for no country are not new to the Games, but a concentrated effort to recruit more of them could bring exciting new competition next year

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The buzzword gives old tricks a new name

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Do you really need the calories or just want them out of habit?

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DNA testing service 23andMe is now FDA approved

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You've probably been taught to run on soft surfaces whenever possible. Truth is, it doesn't make a difference.

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In search of the everyman who will make bike commuting the norm

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Cameras that shoot 360-degree footage could make virtual fitness classes a reality. But the tech’s not quite there yet.

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Ultra coaches Eric Orton and Jason Koop on the importance of strength and speed over mileage

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We like the price, but can this bra stand up to more expensive options from established sports brands? We put three models to the test to find out.

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The so-called superfood is attempting a comeback, but don’t be fooled by its siren call

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What the purchase by a Chinese billionaire means for the sport

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We test three of the latest performance fuels in search of the ultimate podium snack

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From extreme athlete Niccolo Porcella, the man who survived The Biggest Wipeout Ever

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No, athletes aren't OD'ing on salt pills. But here's when you should lay off of them.

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Columbia Sportswear announces it will pay two people a full six-month salary, plus benefits, to test gear around the world

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Crush your next mountain adventure

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A quick way to faster recovery and fewer injuries

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A semi-scientific guide to sussing out the cheats

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Have a blast while keeping your bike tire side down

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A primer from overall winner of the Canadian Death Race, Alissa St. Laurent

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Brought to you on film by running’s greatest bromantical couple

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The trick is educating them with these honest, science-supported reasons why pets make our lives better

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Once AT speed record attempt is complete

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Exercises guaranteed to up your game, no matter your sport

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