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What on Earth Happened to Tough Mudder?

Bankruptcy, injury and apathy: how a 2010s fitness darling was knocked off course

How to Go Sledding as an Adult, According to a Skateboarder

Ian Graham on how to fall, what to wear and the great boombox question

Dispatches From the Wildest Marathon You’ve Never Heard Of

What it's like to run 26.2 with Nick Bare on a private ranch outside Austin

The Best Part About This Surfing Vacation: No Experience Required

You don’t even need to know how to pop up before booking a trip to Kalon Surf on Costa Rica’s Pacific coastline

A Beginner’s Guide to Skiing the Backcountry

Adventure skiing is still alive and well...if you're willing to work a little

The Fat Tire Bike Is a Year-Round Cardio Champ

It's low-impact, Arnold-approved and capable on sand or snow

Meet the First Woman to Scale the Seven Second Summits

Jenn Drummond talks K2, raising kids and the car crash that changed her life

Inside the Wild World of Utah’s Finest Avalanche-Fighters

Remembering the generational "powder panic" that hit Alta and Snowbird last season, from a skier who was interlodged in April

Inside the Navy SEALs’ Mythical “Monster Mash” Marathon

Former SEAL Jonathan Wilson breaks down the grueling training exercise, and the 211-mile Veterans Day challenge it inspired

Why Folding Bikes Aren’t Just for City Living

Believe it or not, the tiny two-wheelers belong in your adventure routine

This Is America’s Best Road for Downhill Skating

Maryhill is a historic 25-curve track in the Pacific Northwest, with a fascinating backstory

The 19-Year-Old Gamer Who Became a Professional Race Car Driver

Jann Mardenborough talks about his improbable rise, and "Gran Turismo," the Neill Blomkamp movie that captures it

The One Runner You Should Be Following on Strava Right Now

Russ Cook, aka @hardestgeezer, is currently attempting to run the entire length of Africa

How Nick Bare Pioneered the “Hybrid Athlete” Revolution

The bodybuilding ultramarathoner talks military days, supplements and what's next

The Ultimate Endurance Race Calendar: 12 Months, 12 Events

From running the Arctic to rowing the Atlantic, it doesn't get more diabolical than this.

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News, advice and insights for the most interesting person in the room.

The 19-Year-Old Gamer Who Became a Professional Race Car Driver

Jann Mardenborough talks about his improbable rise, and "Gran Turismo," the Neill Blomkamp movie that captures it

The One Runner You Should Be Following on Strava Right Now

Russ Cook, aka @hardestgeezer, is currently attempting to run the entire length of Africa

How Nick Bare Pioneered the “Hybrid Athlete” Revolution

The bodybuilding ultramarathoner talks military days, supplements and what's next

The Ultimate Endurance Race Calendar: 12 Months, 12 Events

From running the Arctic to rowing the Atlantic, it doesn't get more diabolical than this.

How to Get Into “Himalayan Shape”

A training blueprint for those with zero plans of actually climbing Everest

Can Lindsay Brewer Make It to the Indy 500?

The 26-year-old talks G-force workouts, Mario Kart and breaking down barriers

10 Easy-Entry American Road Races Worth Traveling For

From Maine to Hawaii, consider this a bucket list for the casual runner

The Legendary Green Beret Who Lives Like a Modern Samurai

Tu Lam, the man behind Ronin Tactics, on waking up and preparing to die

How Keanu Reeves’ John Wick Stays in ‘Assassin Shape’

The man's played John Wick for a decade. How the hell does he do it?

Knocking Around Iceland’s Adventure Coast

The nation is less touristed than you think, especially in the south

How I Swam Around the Entire Island of Great Britain

All it took? 157 days, 1,792 miles and more than a few mental pep talks

Can You Get Good at Surfing Without Stepping in the Water?

Surf skating offers a thrilling alternative for those without access to waves

The People Who Run 60 Miles, Every Single Day, for 52 Days

It's the longest road race in the world, and it happens on a block in Queens

How a 20-Year-Old Ran 100 Miles Through British Columbia

Battling blisters, demons and sub-zero temps, Darius Sam pulled off the unthinkable. We spoke to the Indigenous Canadian to find out how he did it.

There’s Good Shape. Then There’s Red Bull Cliff Diving Shape.

What it takes to artfully fling yourself off balconies, bluffs and bridges

Navy SEAL Kaj Larsen's Guide to Becoming a Better Swimmer

The best waterman in his class talks dolphins, breath exercises and something called "surf torture"