The GR20 Trail Quest

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

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

Take a look at all the numbers from Ryan Sandes and Ryno Griesel's record-breaking adventure in the Himalayas.

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

Watch highlights from Friday’s stage, where dry tracks can become muddy bogs in wet weather conditions.

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

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

Watch highlights from Saturday’s stage, where dry tracks can become muddy bogs in wet weather conditions.

Trailblazers Ryan Sandes and Ryno Griesel embark on the Drakensberg Grand Traverse to beat the world record.

Watch highlights from Sunday’s stage, where dry tracks can become muddy bogs in wet weather conditions.

Watch the action from the women's cross-country race at Leogang – 3.6km long, the course offers long climbs.

Watch the action from the men's cross-country race at Leogang – 3.6km long the course offers long climbs.

Ueli Steck is one of the world's fastest climbers. Setting The Eiger speed record is his next goal.

Follow ultrarunner Courtney Atkinson’s story as he ran across every Australian state and territory in a week.