The fitness giant works hard to polish their public image—to the extent of confronting or even suing those who criticize CrossFit on social media. What gives?

Fun for the whole family doesn't have to mean boring for you. These high-adrenaline festivals will keep everyone going all day.

Two-time World's Toughest Mudder champ Junyong Pak, 36, on mastering the mud

Plenty of races forgo the clock, but few are more fun than the European cycling tradition that’s blowing up ­stateside

Why you don’t need a PH.D. in fitness

Easy gear upgrades to get you race-ready without mortgaging the house

In the wake of a controversial death, OCR hopes to better manage risk with the help of a new sanctioning body.

The drowning of Avishek Sengupta at an obstacle challenge last April was ruled an accident, but his family and friends believe that the sport’s most prominent company did a terrible job of monitoring safety at a water obstacle called Walk the Plank. Elliott D. Woods looks at the life of a remarkable amateur athlete and explains why his tragic end may lead to a multimillion-dollar legal fight.

There’s a number that controls your fitness destiny. And odds are you’re not doing enough to improve it.

The CrossFit backlash is in full swing—led by a long list of injured participants

Inside the mind and training habits of the fastest woman in Kona history

Sometimes, what's common knowledge doesn't need scientific validation. Listen to the advice of these two legendary athletes and remember that even the strongest of us need a little rest and relaxation.

The Tough Mudder and Spartan Race champ is paving a new path through the sport

End summer right. Celebrate Labor Day with our make-your-own backyard pentathlon.

Mike Donoghue, the founder of Amphibious Medics, a private medical-staffing contractor for the nation’s largest events, including Tough Mudder and Spartan Race, offers his insider tips

Surefire energy comes with Hobie Call's delicious wheatgrass smoothie

Obstacle races are slowly supplanting 5ks as the Weekend Warrior’s activity of choice. But with so many choices how does one know which grueling crawl under barbed wire is the right one for them?

Obstacle-course racing is the nation’s fastest-growing sport, with millions of annual participants. It’s time to join the party with our handy guide to all things obstacle racing.

The pros share their secrets for tackling the sport’s most popular obstacles

The eight-week training plan for obstacle-course domination. PLUS: The Dos and Don'ts of race day gear

The obstacle racing phenom on how he stays fit to compete

The ultimate guide to finding your ideal race

There's a new generation taking over the Bay Area who aren't afraid to play as hard as they work.

Outside reviews the best women's apparel that missed the cut for the Summer 2013 Buyer’s Guide, including the Salomon Endurance ¾ Tight.

Taking a close look at Avishek Sengupta’s death, and why water obstacles—not electric shocks—may prove to be the most dangerous

The recent death of a Tough Mudder participant is giving obstacle-racing fans pause: Are organizers pushing competitors too far with their trademark challenges?

Is it therapy for a society deeply affected by the wars of our time, a renegade sport for rebels who can't stand rules and restrictions, or something else entirely?

Weekend gladiators are lining up in droves to risk hypothermia and electroshock in obstacle races by the millions and contributing to one of the fastest growing industries in our world

Pain is the name of the game at Tough Mudder, Spartan Race, and other big obstacle-course races

Heidi Volpe speaks with Rich Roll about his transformation from addict to ultra-endurance athlete

Obstacle courses are the biggest thing in adventure sports, with millions of amped-up Americans charging into the slop—and a cadre of cutthroat entrepreneurs cashing in. No one is profiting more than Tough Mudder creator Will Dean, a polished Englishman and Harvard Business School grad who will stop at nothing to sell you his brand of suffering.

The obstacle course craze is taking over America. This year some 1.5 million people will enter an event. But behind all the dirty fun is a nasty business and legal battle between entrepreneurs looking to cash in. Here, in a preview of Outside’s November cover story, is a glimpse at just how far they’ll go to sell you their brand of pain.

Increasingly, race organizers are testing non-elite athletes for performance-enhancing drugs. But is it fair, or even possible, to hold amateurs to the same stringent standards as the pros?

I'm looking to maximize my triathlon training days. Could you recommend a few places?

We crack the evolution of the safety helmet

A combined heart-rate monitor and GPS watch will supercharge your training. Motorola's Motoactv is one of the best on the market.

Welcome to the frozen, on fire, wet, barb-wired world of Tough Mudder—where adventure racing starts to look a lot more like hazing

After competing in more than two dozen adventure races, Stephen Regenold breaks down his go-to outdoor gear

Your Challenge: Choosing the right adventure in New Zealand, a place that offers the best of everything. Your Solution: Our heavily researched, carefully formulated, and totally brilliant ten-step plan.

Which sporty watch would you recommend for someone that bikes, snowboards, hikes, and surfs? I am not so concerned with tide info, but I do want something that would keep him from getting lost when snowboarding or mountain biking in the backcountry! Shannon Temecula, CA

My son has requested a soft shell jacket as a gift. He seeks something similar to his Columbia shell with internal fleece jackets (3-in-1) of his youth. I think he wants the shell and doesn't care if it zips into a liner. Your suggestions? Susan Cedar Rapids, MI

Page 2