Fernanda Maciel takes on two iconic mountains

Ever wondered who films the projects of world-beating trail runners and how they do it? Wonder no more.

Most people need several days to take on two alpine challenges. Can ultrarunner Fernanda Maciel do it in one?

Ever wondered who films the projects of world-beating trail runners and how they do it? Wonder no more.

Runner Fernanda Maciel aims to be the first woman to climb up and down a 6,961m mountain in a day.

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

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

The downhill track in Val di Sole is known for being one of the most technical and demanding in the world.

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

Felix Baumgartner attempts a world record-setting 36,500m freefall from the edge of the stratosphere.

Watch the first day of action as the top GT racers compete at Hangar-7 in Salzburg, Austria.

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

Facing altitude challenges and health risks, a bike team set out to conquer Tanzania's Mount Kilimanjaro.

Two riders and a mechanic from the Thömus racing team compete to change bike wheels the fastest.

Lindsey Vonn is the first skier to take on the ultimate challenge in downhill skiing – the Streif – at night.