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On an 80-degree morning, a group of world-class swimmers stood in their Speedos and swim caps on a pebbly beach east of Phoenix.

Lhakpa Sherpa has climbed Mount Everest 10 times, the most ascents ever by a woman. She has no plans of slowing down.

Competitive free divers aim to go as deep as possible. But fun dives, even extreme ones, have always been intrinsic to the sport. Denis Grosmaire would know.

Oz Pearlman, better known as Oz the Mentalist, ran 19 loops of Central Park — 116 miles — in a single day.

The most advanced science in the triathlon world can be found in Norway, where athletes embrace the data found in heat sensors, oxygen measuring masks and their feces.

It was a prideful journey for the Nepalese climbers, who historically haven’t received their due.

Taking care of our planet shouldn’t be a partisan issue. These activist-athletes think the flag might help bridge the divide.

Maya Gabeira didn’t just ride the biggest wave ever ridden by a woman. It was the biggest wave surfed by anyone in the 2019-20 winter season, a first for women in professional surfing.

There’s also a widening schism between surfers able to get in the ocean and those forbidden from doing so.

With widespread stay-at-home orders, they are using social media to stream their workouts. But many trainers are facing financial straits from a lack of paying clientele.

Where culinary bliss meets environmental peril, and how to solve America’s poke problem.

Parts of the southern border are ecological wonderlands. The wall threatens 23 endangered and at-risk species.

The US prison system is broken. It sucks up billions of dollars each year and destroys lives.

In One Of The Most Complex Caves In The World, A Handful Of Divers Raced Against The Clock To Locate The Stranded Team

Our late model Landcruiser bumped along two wheel tracks toward the largest complex of sand dunes in Mongolia.

The ceremony began before 7 a.m. at the spirit house, built near the base of a massive shade tree.

Natalia Molchanova, widely regarded as the greatest free diver in history, wore her favorite purple wet suit Sunday on a chartered boat off the coast of Formentera, an island near Ibiza.

Saving lives in the jungle of death.

Nicholas Mevoli of Brooklyn competing in May in Honduras, where he became the first American to free dive to 100 meters.