Running the Appalachian Trail

Karl Meltzer reflects on his record-breaking feat after spending 45 days running along the Appalachian Trail.

Ultrarunner Karl Meltzer embarks on his third and final attempt to run the Appalachian Trail in record time.

Karl Meltzer reflects on his record-breaking feat after spending 45 days running along the Appalachian Trail.

Follow ultramarathoner Karl Meltzer as he runs North America's Pony Express, from California to Missouri.

Ruy Ueda aims to set the new fastest-known time for running all of Mount Fuji’s main trails in one stroke.

Ryan Sandes shares his nutrition plan for before and during his Great Himalaya Trail run.

Ultrarunner François d’Haene attempts to break the record for running the 180km GR20 trail.

Will Ryan Sandes's extreme training help him win the Western States 100-Mile Endurance Run in record time?

After weeks of practice and more than a few mishaps, Alex Honnold and Tommy Caldwell attempt the record.

Watch previously unreleased footage of attempts, slams, makes and throwaway clips from Ryan Sheckler's part.

A rivalry for the speed record up The Nose of El Capitan pushes climbers to their limits.

Ultrarunners Ryan Sandes and Ryno Griesel set out to run the Great Himalaya Trail in the fastest known time.

See Aaron Gwin's run in the downhill race in Fort William, United Kingdom.

Ultrarunner Florian Neuschwander is out to run a record 80km at the 2016 Wings for Life World Run.

Find out how Ryan Sandes trained leading up to his Great Himalaya Trail run.

Max Stöckl's quest to be the fastest man on a mountain bike takes him from Austria to the mountains of Chile.

Ryan Sandes and Ryno Griesel study the route for their Great Himalaya Trail run and start packing their bags.

Go behind the scenes with this string of previously unreleased footage from Alex Midler's part.

Watch Trystan Hart's third-place run from his perspective in the final race at Red Bull TKO.