Conrad Anker, a renowned mountaineer and professional climber who suffered a heart attack while at 20,000 feet on Lunag Ri, the tallest unclimbed peak in the Himalayas.

Travis Rice, a big-mountain freeride snowboarder, filmmaker and designer who survived a near-fatal avalanche while riding in the backcountry of Alaska.

Jimmy Chin, who recounts his own story of how a class four avalanche transformed the way he approaches his work and life.

Angel Collinson, a big mountain skier who survived an epic fall that sent her tumbling 1,000 feet down the side of a mountain in Alaska.

Alex Honnold, professional rock climber, who was pushed to his physical and mental limits while climbing the Atlas Mountains of Morocco with his close friend and world-class climber Tommy Caldwell.

Will Gadd, a legendary climber who would stop at nothing to accomplish his goal of being the first to climb Helmcken Falls, a 430-foot frozen waterfall in British Columbia.

Justine Dupont prepares to ride big waves, but she has to face down fear and risk.

Kayaking legends Ben Stookesberry and Chris Korbuic accumulate together hundreds of first descents in the most dangerous rapids in the world; but the Lukuga River, in Congo, has left a particular mark on them.

Gerd Serrasolses, a kayaker who was knocked unconscious after falling down a 50-foot waterfall while filming in Chiapas, Mexico.

Sarah McNair Landry and her brother Eric share their story of kite-skiing the Northwest Passage in winter only to be hunted by polar bears.