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

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

In one of the most complex caves in the world, a handful of divers raced against the clock to locate the stranded team

Keenan was a legend in the sport—and is the first rescue diver to die while freediving

On Cinco de Mayo, a group of swimmers will set out from a beach in San Diego and swim south, landing in Tijuana, in defiance of President Trump’s restrictions and rhetoric on immigration

The director of the acclaimed documentary 'Sharkwater' disappeared mysteriously after a deep dive off the coast of Key Largo on Tuesday. For 72 hours, crews scoured the ocean. On Friday, shortly after the search for Stewart was suspended, divers found his body on the bottom of the ocean floor.

Long breath-holds put beginner freedivers at risk of abnormal cardiac rhythms

On Sunday, the world's greatest freediver—a 13-year veteran of the sport, holder of 41 world records—descended to a modest depth of about 130 feet. She hasn't been seen since.

The leader of the Free Burma Rangers keeps his identity secret. But he’s real, and he’s definitely hardcore. A former U.S. Special Forces operative—and an ordained minister, climber, and triathlete—he trains rebels and refugees in the fine art of outwitting one of the world’s most oppressive regimes to deliver humanitarian aid. Adam Skolnick hits the trail with a soldier on a mission from God.

Turn your vacation into a full-body recalibration with these performance-enhancing getaways

After landing at Bangkok’s glass-plated Suvarnabhumi Airport, which opened in September, you’ll be forgiven for thinking the entire country’s been upgraded. The new facility is equipped to land Airbus’s 555-passenger A380 and then speed visitors downtown via light rail—currently under construction—in just 15 minutes. (Anyone who’s ever braved a cab…

Will you look ridiculous trying a Hollywood workout? Quite possibly. But you'll also tap into America's greatest training resource.

So it's a vast, faraway adventure mecca,no worries, mate! Here come ten abso-bloody-lutely awesome Australian odysseys—from Sydney to the bush—plus locals' picks and all the beta you need to get there.

Are you wasting valuable munch time on food you don't need? A cutting-edge gene test may tell you exactly what your body requires to stay healthy, grow stronger, and recover faster.

Stash the skis and bust out the sequined thongs—it's Carnival time in the tropics. Seaside adventure and rum-fueled hedonism await.