The clean before the mud. Photo: Merrell Down and Dirty Mud Run Last year, more than a million people participated in obstacle-course races like Tough Mudder, Muddy Buddy, Spartan Race, and Warrior Dash. These events market misery to the masses—requiring entrants to navigate ridiculously punishing courses of hills, mud,…

The list of alpinists who've climbed all 14 of the world's 8,000-meter peaks without supplemental oxygen is exceedingly small. And it includes exactly one woman.

The ultimate North American winter bucket list

Like the sport’s competitors, good OCR shoes must be tough, versatile, and able to withstand everything sadistic race organizers throw at them. They also better feel good on your feet. That mix isn’t always easy to find in a sneaker, so I called on Outside’s obstacle-course racing expert Erin…

Former reality-show skipper Chris Fischer has revolutionized shark science—with a daring system for catching the beasts alive and a radical new research-funding model. During an expedition off the coast of Chile that was interrupted by an undersea earthquake, our man wonders if this guy is the next Cousteau or a corporate-sponsored hype machine.

The New York Power Authority announced Wednesday that it will be applying for a lease from federal regulators to build one of the nation's first offshore wind farms, according to Reuters.The farm would be built in the Atlantic Ocean 13 to 15 miles off Long Island with the goal…

Week of February 6-12, 1997 Camping on the cheap on Kauai Running the grueling Badwater 146 Hiking Mount Robson’s Berg Lake Trail Helping students plan their own adventure Easy-access diving off Belize beaches Easy-access diving off Belize beaches Question: I’m looking for information…

An incredibly beautiful time-lapse of a forest fire burning out of control in northern New Mexico. May 31, 2013.

Brian Blickenstaff spent a day without his clothes on, taking baths with complete strangers

Get a solid endurance base through heart-rate training.